METHOD FOR MANUFACTURING EQUAL-STRENGTH STEEL THIN-WALL WELDING COMPONENT WITH ALUMINUM OR ALUMINUM ALLOY PLATING

Abstract

Disclosed is a method for manufacturing an equal-strength steel thin-wall welding component with an aluminum or aluminum-alloy plating, wherein the plating comprises an intermetallic compound alloy layer in contact with the base body and a metal alloy layer on the intermetallic compound alloy layer; the plating is not removed or thinned before or during welding; and by presetting a welding gap and using a carbon-manganese-steel welding wire, a welding process and protective gas for welding, the tensile strength of a welding seam of the welding component after hot stamping processing is greater than the tensile strength of a base metal, and the elongation of a welded joint is greater than 4% Further disclosed are a welding wire for welding and an equal-strength steel thin-wall welding component with an aluminum or aluminum-alloy plating.

Claims

1. A method for manufacturing an equal-strength steel thin-wall welded component with an aluminum or aluminum alloy clad layer, comprising the following steps: 1) Taking a straight steel plate to be used as a steel plate to be welded, wherein the steel plate to be welded comprises a substrate and at least one clad layer on a surface thereof, wherein the clad layer comprises an intermetallic compound alloy layer in contact with the substrate and a metal alloy layer thereon, wherein the clad layer in a to-be-welded zone of the steel plate to be welded is not removed or thinned; 2) Presetting a butt gap between two steel plates to be welded at 0.2-0.5 mm; and 3) Conducting welding by a laser filler wire welding process, a laser composite filler wire welding process or a gas metal arc welding process to obtain a final equal-strength steel thin-wall welded component with an aluminum or aluminum alloy clad layer, wherein the laser filler wire welding process uses a laser spot having a diameter of from 0.8 to 2.0 mm, a defocus distance of from −10 to 10 mm, a laser power controlled at from 4 to 6 kW, a welding speed controlled at from 40 to 140 mm/s, a welding wire having a diameter of from 0.8 to 1.4 mm, and a wire feeding speed of from 2 to 8 m/min; wherein the laser composite filler wire welding process uses a laser spot having a diameter of from 0.4 to 1.2 mm, a defocus distance of from −10 to 10 mm, a laser power controlled at from 1 to 5 kW, a welding speed controlled at from 40 to 140 mm/s, a welding wire having a diameter of from 0.8 to 1.4 mm, a wire feeding speed of from 2 to 8 m/min, a welding electric current of 80-100 A, and an electric voltage of 18-25 V; and the gas metal arc welding process uses a welding electric current of 110-130 A, and a welding electric voltage of 18-25 V, a welding speed of from 300 to 800 mm/min, and a welding wire having a diameter of from 0.8 to 1.4 mm.

2. The method for manufacturing an equal-strength steel thin-wall welded component with an aluminum or aluminum alloy clad layer according to claim 1, wherein during the welding in step 3), a shielding gas is one containing an active gas, wherein the active gas has a volume percentage of from 5% to 100%.

3. The method for manufacturing an equal-strength steel thin-wall welded component with an aluminum or aluminum alloy clad layer according to claim 1, wherein the substrate of the steel plate to be welded has a composition based on weight percentage of C: 0.08-0.8%, Si: 0.05-1.0%, Mn: 0.1-5%, P<0.3%, S<0.1%, Al<0.3%, Ti<0.5%, B: 0.0005-0.1%, Cr: 0.01-3%, and a balance of Fe and other unavoidable impurities.

4. The method for manufacturing an equal-strength steel thin-wall welded component with an aluminum or aluminum alloy clad layer according to claim 3, wherein the substrate of the steel plate to be welded has a composition based on weight percentage of C: 0.1-0.6%, Si: 0.07-0.7%, Mn: 0.3-4%, P<0.2%, S<0.08%, Al<0.2%, Ti<0.4%, B: 0.0005-0.08%, Cr: 0.01-2%, and a balance of Fe and other unavoidable impurities.

5. The method for manufacturing an equal-strength steel thin-wall welded component with an aluminum or aluminum alloy clad layer according to claim 3, wherein the substrate of the steel plate to be welded has a composition based on weight percentage of C: 0.15-0.5%, Si: 0.1-0.5%, Mn: 0.5-3%, P<0.1%, S<0.05%, Al<0.1%, Ti<0.2%, B: 0.0005-0.08%, Cr: 0.01-1%, and a balance of Fe and other unavoidable impurities.

6. The method for manufacturing an equal-strength steel thin-wall welded component with an aluminum or aluminum alloy clad layer according to claim 1, wherein the substrate of the steel plate to be welded has a thickness of from 0.5 mm to 3 mm.

7. The method for manufacturing an equal-strength steel thin-wall welded component with an aluminum or aluminum alloy clad layer according to claim 1, wherein the clad layer of the steel plate to be welded is pure aluminum or aluminum alloy, wherein the aluminum alloy has a composition based on weight percentage of Si: 5-11%, Fe: 0-4%, and a balance of Al and other unavoidable impurities.

8. The method for manufacturing an equal-strength steel thin-wall welded component with an aluminum or aluminum alloy clad layer according to claim 1, wherein the welding wire used for the welding in step 3) has a composition based on weight percentage of C 0.05-0.16%, Si 0.2-0.5%, Mn 1.5-2.8%, P≤0.03%, S≤0.005%, Al<0.06%, Ni 1.5-3%, Cr 0.05-0.2%, Mo 0.1-0.7%, and a balance Fe and other unavoidable impurities.

9. A welding wire for welding, having a composition based on weight percentage of C 0.05-0.16%, Si 0.2-0.5%, Mn 1.5-2.8%, P≤0.03%, S≤0.005%, Al<0.06%, Ni 1.5-3%, Cr 0.05-0.2%, Mo 0.1-0.7%, and a balance Fe and other unavoidable impurities, and a welding wire diameter of 0.8-1.4 mm.

10. An equal-strength steel thin-wall welded component with an aluminum or aluminum alloy clad layer manufactured by the method of claim 1.

11. An equal-strength steel thin-wall welded component with an aluminum or aluminum alloy clad layer, wherein the equal-strength component comprises a steel plate comprising a substrate and at least one clad layer on a surface thereof, wherein the clad layer comprises an intermetallic compound alloy layer in contact with the substrate and a metal alloy layer thereon, wherein the substrate has a composition based weight percentage of C: 0.08-0.8%, Si: 0.05-1.0%, Mn: 0.1-5%, P<0.3%, S<0.1%, Al<0.3%, Ti<0.5%, B: 0.0005-0.1%, Cr: 0.01-3%, and a balance of Fe and unavoidable impurities; wherein a welding wire for welding the steel plate of the equal-strength component has a composition based on weight percentage of C 0.05-0.16%, Si 0.2-0.5%, Mn 1.5-2.8%, P<0.03%, S<0.005%, Al<0.06%, Ni 1.5-3%, Cr 0.05-0.2%, Mo 0.1-0.7%, and a balance Fe and other unavoidable impurities.

12. The equal-strength steel thin-wall welded component with an aluminum or aluminum alloy clad layer according to claim 11, wherein the substrate has a composition based on weight percentage of C: 0.1-0.6%, Si: 0.07-0.7%, Mn: 0.3-4%, P<0.2%, S<0.08%, Al<0.2%, Ti<0.4%, B: 0.0005-0.08%, Cr: 0.01-2%, and a balance of Fe and other unavoidable impurities.

13. The equal-strength steel thin-wall welded component with an aluminum or aluminum alloy clad layer according to claim 11, wherein the clad layer of the sequal-strength steel thin-wall welded component with an aluminum or aluminum alloy clad layer is pure aluminum or aluminum alloy, wherein the aluminum alloy comprises a composition based on weight percentage of Si: 5-11%, Fe: 0-4%, and a balance of Al.

14. The equal-strength steel thin-wall welded component with an aluminum or aluminum alloy clad layer according to claim 11, wherein the substrate of the equal-strength steel thin-wall welded component with an aluminum or aluminum alloy clad layer has a thickness of from 0.5 mm to 3 mm.

15. The equal-strength steel thin-wall welded component with an aluminum or aluminum alloy clad layer according to claim 11, wherein a welding line of the equal-strength steel thin-wall welded component has a tensile strength of not less than 1300 MPa; a welding joint has an elongation of greater than 4%; if the welding joint is fractured under a tensile load, the fracture occurs in the substrate; the tensile strength of the welding line is higher than that of the substrate.

16. The method for manufacturing an equal-strength steel thin-wall welded component with an aluminum or aluminum alloy clad layer according to claim 8, wherein the welding wire used for the welding in step 3) has a composition based on weight percentage of C 0.05-0.14%, Si 0.3-0.5%, Mn 1.5-2.4%, P<0.02%, S<0.005%, Al<0.06%, Ni 1.5-3%, Cr 0.05-0.2%, Mo 0.3-0.7%, and a balance Fe and other unavoidable impurities.

17. The method for manufacturing an equal-strength steel thin-wall welded component with an aluminum or aluminum alloy clad layer according to claim 8, wherein the welding wire used for the welding in step 3) has a composition based on weight percentage of C 0.07-0.14%, Si 0.3-0.5%, Mn 1.5-2.2%, P<0.02%, S<0.005%, Al<0.06%, Ni 1.8-3%, Cr 0.1-0.2%, Mo 0.4-0.7%, and a balance Fe and other unavoidable impurities.

18. The welding wire for welding according to claim 9, having a composition based on weight percentage of C 0.05-0.14%, Si 0.3-0.5%, Mn 1.5-2.4%, P<0.02%, S<0.005%, Al<0.06%, Ni 1.5-3%, Cr 0.05-0.2%, Mo 0.3-0.7%, and a balance Fe and other unavoidable impurities.

19. The welding wire for welding according to claim 9, having a composition based on weight percentage of C 0.07-0.14%, Si 0.3-0.5%, Mn 1.5-2.2%, P<0.02%, S<0.005%, Al<0.06%, Ni 1.8-3%, Cr 0.1-0.2%, Mo 0.4-0.7%, and a balance Fe and other unavoidable impurities.

20. The equal-strength steel thin-wall welded component with an aluminum or aluminum alloy clad layer according to claim 12, wherein the substrate has a composition based on weight percentage of C: 0.15-0.5%, Si: 0.1-0.5%, Mn: 0.5-0.3%, P<0.1%, S<0.05%, Al: 0.01-0.09%, Ti: 0.01-0.2%, B: 0.001-0.02%, Cr: 0.15-0.8%, and a balance of Fe and other unavoidable impurities.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0063] FIG. 1 is a curve graph showing the tensile performance of a welding joint after hot stamping in Example 1 according to the present disclosure.

[0064] FIG. 2 is an image showing the cracking position of the tensile sample of a welding joint after hot stamping in Example 1 according to the present disclosure.

[0065] FIG. 3 is a metallographic diagram of a welding joint after hot stamping in Example 1 according to the present disclosure.

[0066] FIG. 4 shows the hardness distribution of a welding joint after hot stamping in Example 1 according to the present disclosure.

DETAILED DESCRIPTION OF THE INVENTION

[0067] The disclosure will be further illustrated with reference to the following Examples and accompanying drawings.

Example 1

[0068] A hot formed steel plate to be welded was subjected to surface cleaning to remove contaminants such as oil and water stains from the surface to guarantee cleanliness of the surface.

[0069] The 1.75 mm steel plate having an aluminum alloy clad layer (see Table 1 for the composition of the steel plate) was subjected to laser filler wire tailor welding using the following process: a welding wire as described in the present disclosure (see Table 2 for the composition of the welding wire), a light beam having a spot diameter of 1.8 mm, a welding power of 4.5 kW, a welding speed of 80 mm/s, a preset butt gap of 0.3 mm, a defocus distance of 8 mm, a wire feeding speed of 3 m/min, a welding wire diameter of 1.2 mm, a shielding gas of 90% argon+10% carbon dioxide gas, and a gas flow of 15 L/min were used.

[0070] After the welding, metallographic examination was conducted on the cross-section of the welding line. The macromorphology of the welding line was excellent, and there was no obvious spatter.

[0071] After the welding, the tailor welded blank was subjected to hot stamping and quenching, wherein the heating temperature was 945° C., the heating time was 4 minutes, and the blank was pressurized in a water-passing mold for 10 seconds.

[0072] After the above-mentioned thermal cycle, the tailor welded blank was first completely austenitized. During the heating, atoms diffused between the clad layer and the steel, so that the original clad layer completely transformed into an intermetallic compound layer having a thickness larger than the thickness of the original clad layer. In addition, this layer had the characteristics of high melting point and high hardness, which prevented oxidation and decarburization of the substrate during the heating stage and the pressurizing stage. During the pressurizing stage in the mold, martensitic transformation occurred in the tailor welded blank. Then, evaluation was conducted on the performances of the welding joint according to Table 3. See FIG. 1 for the tensile curve of the welding joint, FIG. 2 for the fracture position, FIG. 3 for the metallographic image of the joint (no granular ferrite was observed in the welding line structure), and FIG. 4 for the hardness of the joint. See Table 3 for the performances of the tailor welded blank after the hot stamping.

Example 2

[0073] A hot formed steel plate to be welded was subjected to surface cleaning to remove contaminants such as oil and water stains from the surface to guarantee cleanliness of the surface.

[0074] The 1.8 mm steel plate having an aluminum alloy clad layer (see Table 1 for the composition of the steel plate) was subjected to laser filler wire tailor welding using the following process: a welding wire as described in the present disclosure (see Table 2 for the composition of the welding wire), a light beam having a spot diameter of 2.0 mm, a welding power of 6 kW, a welding speed of 80 mm/s, a preset butt gap of 0.5 mm, a defocus distance of 10 mm, a wire feeding speed of 4 m/min, a welding wire diameter of 1.2 mm, a shielding gas of 80% argon++20% carbon dioxide gas, and a gas flow of 15 L/min were used.

[0075] After the welding, metallographic examination was conducted on the cross-section of the welding line. The macromorphology of the welding line was excellent, and there was no obvious spatter.

[0076] After the welding, the same hot stamping process as that used in Example 1 was used for flat plate hot stamping. See Table 3 for the performances of the tailor welded blank after the hot stamping.

Example 3

[0077] A hot formed steel plate to be welded was subjected to surface cleaning to remove contaminants such as oil and water stains from the surface to guarantee cleanliness of the surface.

[0078] The 1.5 mm steel plate having an aluminum alloy clad layer (see Table 1 for the composition of the steel plate) was subjected to laser filler wire tailor welding using the following process: a welding wire as described in the present disclosure (see Table 2 for the composition of the welding wire), a light beam having a laser spot diameter of 1.8 mm, a welding power of 5 kW, a welding speed of 80 mm/s, a preset butt gap of 0.4 mm, a defocus distance of 8 mm, a wire feeding speed of 3 m/min, a welding wire diameter of 1.2 mm, a shielding gas of 60% argon+40% carbon dioxide gas, and a gas flow of 15 L/min were used.

[0079] After the welding, metallographic examination was conducted on the cross-section of the welding line. The macromorphology of the welding line was excellent, and there was no obvious spatter.

[0080] After the welding, the same hot stamping process as that used in Example 1 was used for flat plate hot stamping. See Table 3 for the performances of the tailor welded blank after the hot stamping.

Example 4

[0081] A hot formed steel plate to be welded was subjected to surface cleaning to remove contaminants such as oil and water stains from the surface to guarantee cleanliness of the surface.

[0082] The 1.4 mm steel plate having an aluminum alloy clad layer (see Table 1 for the composition of the steel plate) was subjected to laser filler wire tailor welding using the following process: a welding wire as described in the present disclosure (see Table 2 for the composition of the welding wire), a light beam having a laser spot diameter of 1.8 mm, a welding power of 5 kW, a welding speed of 80 mm/s, a preset butt gap of 0.4 mm, a defocus distance of 8 mm, a wire feeding speed of 2.5 m/min, a welding wire diameter of 1.2 mm, a shielding gas of 60% argon+40% carbon dioxide gas, and a gas flow of 15 L/min were used.

[0083] After the welding, metallographic examination was conducted on the cross-section of the welding line. The macromorphology of the welding line was excellent, and there was no obvious spatter.

[0084] After the welding, the same hot stamping process as that used in Example 1 was used for flat plate hot stamping. See Table 3 for the performances of the tailor welded blank after the hot stamping.

Example 5

[0085] A hot formed steel plate to be welded was subjected to surface cleaning to remove contaminants such as oil and water stains from the surface to guarantee cleanliness of the surface.

[0086] The 1.2 mm steel plate having an aluminum alloy clad layer (see Table 1 for the composition of the steel plate) was subjected to laser filler wire tailor welding using the following process: a welding wire as described in the present disclosure (see Table 2 for the composition of the welding wire), a light beam having a laser spot diameter of 1.8 mm, a welding power of 4.5 kW, a welding speed of 80 mm/s, a preset butt gap of 0.3 mm, a defocus distance of 8 mm, a wire feeding speed of 2 m/min, a welding wire diameter of 1.2 mm, a shielding gas of 40% argon+60% carbon dioxide gas, and a gas flow of 15 L/min were used.

[0087] After the welding, metallographic examination was conducted on the cross-section of the welding line. The macromorphology of the welding line was excellent, and there was no obvious spatter.

[0088] After the welding, the same hot stamping process as that used in Example 1 was used for flat plate hot stamping. See Table 3 for the performances of the tailor welded blank after the hot stamping.

Example 6

[0089] A hot formed steel plate to be welded was subjected to surface cleaning to remove contaminants such as oil and water stains from the surface to guarantee cleanliness of the surface.

[0090] The 1.75 mm steel plate having an aluminum alloy clad layer (see Table 1 for the composition of the steel plate) was subjected to laser filler wire tailor welding using the following process: a welding wire as described in the present disclosure (see Table 2 for the composition of the welding wire), a light beam having a laser spot diameter of 1.4 mm, a welding power of 5 kW, a welding speed of 80 mm/s, a preset butt gap of 0.4 mm, a defocus distance of 7 mm, a wire feeding speed of 5 m/min, a welding wire diameter of 1.0 mm, a shielding gas of 20% argon+80% carbon dioxide gas, and a gas flow of 15 L/min were used.

[0091] After the welding, metallographic examination was conducted on the cross-section of the welding line. The macromorphology of the welding line was excellent, and there was no obvious spatter.

[0092] After the welding, the same hot stamping process as that used in Example 1 was used for flat plate hot stamping. See Table 3 for the performances of the tailor welded blank after the hot stamping.

Example 7

[0093] A hot formed steel plate to be welded was subjected to surface cleaning to remove contaminants such as oil and water stains from the surface to guarantee cleanliness of the surface.

[0094] The 1.8 mm steel plate having an aluminum alloy clad layer (see Table 1 for the composition of the steel plate) was subjected to laser filler wire tailor welding using the following process: a welding wire as described in the present disclosure (see Table 2 for the composition of the welding wire), a light beam having a laser spot diameter of 1.4 mm, a welding power of 5 kW, a welding speed of 80 mm/s, a preset butt gap of 0.4 mm, a defocus distance of 7 mm, a wire feeding speed of 6 m/min, a welding wire diameter of 1.0 mm, a shielding gas of 100% carbon dioxide gas, and a gas flow of 15 L/min were used.

[0095] After the welding, metallographic examination was conducted on the cross-section of the welding line. The macromorphology of the welding line was excellent, and there was no obvious spatter.

[0096] After the welding, the tailor welded blank was subjected to hot stamping and quenching, wherein the heating temperature was 930° C., the heating time was 4 minutes, and the blank was pressurized in a water-passing mold for 10 seconds. See Table 3 for the performances of the tailor welded blank after the hot stamping.

Example 8

[0097] A hot formed steel plate to be welded was subjected to surface cleaning to remove contaminants such as oil and water stains from the surface to guarantee cleanliness of the surface.

[0098] The 1.5 mm steel plate having an aluminum alloy clad layer (see Table 1 for the composition of the steel plate) was subjected to laser filler wire tailor welding using the following process: a welding wire as described in the present disclosure (see Table 2 for the composition of the welding wire), a light beam having a laser spot diameter of 1.4 mm, a welding power of 5 kW, a welding speed of 80 mm/s, a preset butt gap of 0.4 mm, a defocus distance of 7 mm, a wire feeding speed of 6 m/min, a welding wire diameter of 1.0 mm, a shielding gas of 60% argon+40% carbon dioxide gas, and a gas flow of 15 L/min were used.

[0099] After the welding, metallographic examination was conducted on the cross-section of the welding line. The macromorphology of the welding line was excellent, and there was no obvious spatter.

[0100] After the welding, the same hot stamping process as that used in Example 7 was used for flat plate hot stamping. See Table 3 for the performances of the tailor welded blank after the hot stamping.

Example 9

[0101] A hot formed steel plate to be welded was subjected to surface cleaning to remove contaminants such as oil and water stains from the surface to guarantee cleanliness of the surface.

[0102] The 1.4 mm steel plate having an aluminum alloy clad layer (see Table 1 for the composition of the steel plate) was subjected to laser filler wire tailor welding using the following process: a welding wire as described in the present disclosure (see Table 2 for the composition of the welding wire), a light beam having a laser spot diameter of 1.2 mm, a welding power of 4 kW, a welding speed of 80 mm/s, a preset butt gap of 0.4 mm, a defocus distance of 5 mm, a wire feeding speed of 6 m/min, a welding wire diameter of 1.0 mm, a shielding gas of 60% argon+40% carbon dioxide gas, and a gas flow of 15 L/min were used.

[0103] After the welding, metallographic examination was conducted on the cross-section of the welding line. The macromorphology of the welding line was excellent, and there was no obvious spatter.

[0104] After the welding, the same hot stamping process as that used in Example 7 was used for flat plate hot stamping. See Table 3 for the performances of the tailor welded blank after the hot stamping.

Example 10

[0105] A hot formed steel plate to be welded was subjected to surface cleaning to remove contaminants such as oil and water stains from the surface to guarantee cleanliness of the surface.

[0106] The 1.2 mm steel plate having an aluminum alloy clad layer (see Table 1 for the composition of the steel plate) was subjected to laser filler wire tailor welding using the following process: a welding wire as described in the present disclosure (see Table 2 for the composition of the welding wire), a light beam having a laser spot diameter of 1.2 mm, a welding power of 4 kW, a welding speed of 80 mm/s, a preset butt gap of 0.4 mm, a defocus distance of 5 mm, a wire feeding speed of 6 m/min, a welding wire diameter of 1.0 mm, a shielding gas of 60% argon++40% carbon dioxide gas, and a gas flow of 15 L/min were used.

[0107] After the welding, metallographic examination was conducted on the cross-section of the welding line. The macromorphology of the welding line was excellent, and there was no obvious spatter.

[0108] After the welding, the same hot stamping process as that used in Example 7 was used for flat plate hot stamping. See Table 3 for the performances of the tailor welded blank after the hot stamping.

Example 11

[0109] A hot formed steel plate to be welded was subjected to surface cleaning to remove contaminants such as oil and water stains from the surface to guarantee cleanliness of the surface.

[0110] The 1.5 mm steel plate having an aluminum alloy clad layer (see Table 1 for the composition of the steel plate) was subjected to laser filler wire tailor welding using the following process: a welding wire as described in the present disclosure (see Table 2 for the composition of the welding wire), a light beam having a laser spot diameter of 0.6 mm, a welding power of 2 kW, a welding speed of 80 mm/s, a preset butt gap of 0.4 mm, a defocus distance of 5 mm, a wire feeding speed of 6 m/min, a welding wire diameter of 1.0 mm, a shielding gas of 60% argon++40% carbon dioxide gas, a gas flow of 15 L/min, a welding electric current of 90 A and an electric voltage of 20 V for MAG composite tailor welding were used. After the welding, metallographic examination was conducted on the cross-section of the welding line. The macromorphology of the welding line was excellent, and there was no obvious spatter.

[0111] After the welding, the same hot stamping process as that used in Example 1 was used for flat plate hot stamping. See Table 3 for the performances of the tailor welded blank after the hot stamping.

Example 12

[0112] A hot formed steel plate to be welded was subjected to surface cleaning to remove contaminants such as oil and water stains from the surface to guarantee cleanliness of the surface.

[0113] The 1.2 mm steel plate having an aluminum alloy clad layer (see Table 1 for the composition of the steel plate) was subjected to gas metal arc tailor welding using the following process: a welding wire as described in the present disclosure (see Table 2 for the composition of the welding wire), a welding electric current of 120 A, a welding electric voltage of 22 V, a welding speed of 500 mm/s, a preset butt gap of 0.5 mm, a welding wire diameter of 1.0 mm, a shielding gas of 80% argon+20% carbon dioxide gas, and a gas flow of 15 L/min were used. After the welding, metallographic examination was conducted on the cross-section of the welding line. The macromorphology of the welding line was excellent, and there was no obvious spatter.

[0114] After the welding, the same hot stamping process as that used in Example 1 was used for flat plate hot stamping. See Table 3 for the performances of the tailor welded blank after the hot stamping.

TABLE-US-00001 TABLE 1 Steel plate composition weight percentage (wt %) Ex. C Si Mn P S Al Ti B Cr 1 0.15 0.10 2.90 0.059 0.038 0.09 0.090 0.0031 0.15 2 0.25 0.23 1.19 0.015 0.001 0.04 0.030 0.0040 0.27 3 0.49 0.50 2.51 0.024 0.04 0.08 0.027 0.0052 0.51 4 0.39 0.36 3.00 0.044 0.03 0.07 0.05 0.0062 0.71 5 0.50 0.48 0.50 0.081 0.02 0.05 0.20 0.0071 0.20 6 0.15 0.10 2.90 0.059 0.038 0.09 0.090 0.0031 0.15 7 0.25 0.23 1.19 0.015 0.001 0.04 0.030 0.0040 0.27 8 0.49 0.50 2.51 0.024 0.04 0.08 0.027 0.0052 0.51 9 0.39 0.36 3.00 0.044 0.03 0.07 0.05 0.0062 0.71 10 0.50 0.48 0.50 0.081 0.02 0.05 0.20 0.0071 0.20 11 0.49 0.50 2.51 0.024 0.04 0.08 0.027 0.0052 0.51 12 0.50 0.48 0.50 0.081 0.02 0.05 0.20 0.0071 0.20

TABLE-US-00002 TABLE 2 Welding wire composition weight percentage (wt %) Ex. C Si Mn P S Al Cr Ni Mo 1 0.15 0.27 1.65 0.005 0.002 0.031 0.164 1.53 0.69 2 0.12 0.45 1.87 0.03 0.0018 0.056 0.105 2.5 0.34 3 0.10 0.39 2.1 0.024 0.0010 0.057 0.082 3.0 0.43 4 0.08 0.21 2.8 0.03 0.0012 0.045 0.189 2.36 0.21 5 0.06 0.42 1.78 0.0062 0.005 0.030 0.052 2.85 0.58 6 0.15 0.27 1.65 0.005 0.002 0.031 0.164 1.53 0.69 7 0.12 0.45 1.87 0.03 0.0018 0.056 0.105 2.5 0.34 8 0.10 0.39 2.1 0.024 0.0010 0.057 0.082 3.0 0.43 9 0.08 0.21 2.8 0.03 0.0012 0.045 0.189 2.36 0.21 10 0.06 0.42 1.78 0.0062 0.005 0.030 0.052 2.85 0.58 11 0.10 0.39 2.1 0.024 0.0010 0.057 0.082 3.0 0.43 12 0.06 0.42 1.78 0.0062 0.005 0.030 0.052 2.85 0.58

TABLE-US-00003 TABLE 3 Joint performances Joint tensile Joint Sample Joint strength elongation cracking corrosion Ex. (MPa)* (%)* position resistance** 1 1505 >4% Base material Passed 2 1539 >4% Base material Passed 3 1496 >4% Base material Passed 4 1585 >4% Base material Passed 5 1565 >4% Base material Passed 6 1470 >4% Base material Passed 7 1515 >4% Base material Passed 8 1510 >4% Base material Passed 9 1540 >4% Base material Passed 10 1548 >4% Base material Passed 11 1526 >4% Base material Passed 12 1490 >4% Base material Passed *Standard tensile samples having a nominal width of 12.5 mm and an original gauge length of 50 mm were used to measure the tensile strength and elongation of the joints; **The corrosion resistance test was performed according to DIN50021, DIN50017, and DIN50014 standards.