Disclosed herein is an electroslag welding wire containing, by mass % based on total mass of the wire: C: more than 0% and 0.07% or less; Si: more than 0% and 0.50% or less; Mn: more than 0% and 1.0% or less; Ni: 6.0 to 15.0%; and Fe: 79% or more. The electroslag welding wire satisfies the following relationship (1): 0.150≤C+Si/30+Mn/20+Ni/60≤0.300 (1).

A welding system includes a welding power source configured to provide pulsed electropositive direct current (DCEP), a gas supply system configured to provide a shielding gas flow that is at least 90% argon (Ar), a welding wire feeder configured to provide tubular welding wire. The DCEP, the tubular welding wire, and the shielding gas flow are combined to form a weld deposit on a zinc-coated workpiece, wherein less than approximately 10 wt % of the tubular welding wire is converted to spatter while forming the weld deposit on the zinc-coated workpiece.

A self-shielded flux-cored welding wire with a special protective slag coating formed in situ and a manufacture method thereof. The self-shielded flux-cored welding wire includes a low-carbon steel belt and a flux core powder, the flux core powder is filled in the low-carbon steel belt, the flux core powder includes the following ingredients in percentage by mass: 60-80% glass powder, 2-8% zirconium oxide powder, 0.05-0.85% graphene powder, 2-8% potassium carbonate sodium powder, 1-3% potassium titanate powder, 2-5% rutile powder, 1-5% corundum powder, 1-3% sodium fluorosilicate powder, and the balance of iron powder, and a weight of the flux core powder accounts for 13-25% of a total weight of the welding wire.

A flux-cored wire of the present disclosure has a steel sheath and a flux filled at an inside of the steel sheath, has a total amount of moisture by ratio with respect to a total wire mass of 300 ppm or less, has flux containing fluorides, and has an amount of the fluorides by ratio with respect to the total wire mass of, by total of values converted to F, 0.11 mass % or more and 2.50 mass % or less. If using the flux-cored wire of the present disclosure for welding, a stable weld shape can be obtained and, further, the amount of diffusible hydrogen of the weld metal can be reduced. For this reason, the flux-cored wire of the present disclosure can be suitably used for welding high strength steel such as ferrite steel.

Provided is a solder paste which uses a conventional flux, and for which long-term preservation is made possible and an easy preservation method can be realized by suppressing changes in the viscosity of the paste over time. This solder paste is provided with a solder powder, a zirconium oxide powder, and a flux, and changes in the viscosity of the paste over time are suppressed.

Provided is a metal particle for adhesive paste. The metal particle may include a core including at least one metal; and a shell on at least one surface of the core and including at least one metal and nanoparticles. The metal particle may be a transient liquid phase particle and the at least one metal of the core may have a higher melting point than a melting point of the at least one metal of the shell. In addition, provided are a method of preparing the metal particle for adhesive paste, a composite bonding structure formed from the metal particle for adhesive paste, and a semiconductor device including the composite bonding structure.

A TIG welding flux for dissimilar steels is used to solve the problem that the conventional friction stir welding procedure for butt-joint welding a stainless steel workpiece and a carbon steel workpiece cannot be used on site, as well as the problem that the increased operating time and manufacturing cost due to forming bevel faces on both the stainless steel workpiece and the carbon steel workpiece. The TIG welding flux for dissimilar steels includes 25-35 wt % of silicon dioxide (SiO.sub.2), 20-30 wt % of cobalt (II, III) oxide (Co.sub.3O.sub.4), 15-20 wt % of manganese (II, III) oxide (Mn.sub.3O.sub.4), 10-15 wt % of nickel (III) oxide (Ni.sub.2O.sub.3), 7-12 wt % of molybdenum trioxide (MoO.sub.3), 6-11 wt % of manganese (II) carbonate (MnCO.sub.3), 5-10 wt % of nickel (II) carbonate (NiCO.sub.3), and 2-4 wt % of aluminum fluoride (AlF.sub.3).

A flux for electroslag welding used for electroslag welding may include a basic oxide, an amphoteric oxide, an acidic oxide, and a fluoride. With respect to a total mass of the flux, the basic oxide may include 5.1 mass % or more and 30.0 mass % or less of CaO, the acidic oxide includes 17 mass % or less of SiO.sub.2, and the fluoride includes 35 mass % or more and 73 mass % or less of CaF2. A content of the CaO is 30 mass % or more with respect to a total mass of the basic oxide, a content of the SiO.sub.2 is 80 mass % or more with respect to a total mass of the acidic oxide, a content of the CaF.sub.2 is 80 mass % or more with respect to a total mass of the fluoride, and a value of (2×[CaF.sub.2]+[CaO])/[SiO.sub.2] is 5 or more and 56 or less.

A method for forming a metal flow module includes stacking together a first metal plate having opposing first and second major surfaces and one or more flow channels defined at least in part in the first major surface with a second metal plate having opposing first and second major surfaces, the plates stacked together with their respective first major surfaces facing each other and with a layer of flux positioned in between contacting portions of the respective first major surfaces defined as those portions of the respective first and second major surfaces which would be in contact absent the flux; then heating the plates together in a non-oxidizing atmosphere to thermally bond the contacting portions of the respective first major surfaces of the first and second metal plates. Resulting modules are also disclosed.

Provided is a flux-cored wire which can be MIG-welded at any welding position using a pure Ar gas as a shielding gas. A flux-cored wire having a flux filled in the outer skin thereof, wherein TiO.sub.2, Al.sub.2O.sub.3, SiO.sub.2 and ZrO.sub.2 are contained in amounts of 4.7 to 8.5% by mass, 0.5 to 3.5% by mass, 0.5 to 2.0% by mass and 0.8 to 3.0% by mass, respectively, and metal oxides are also contained in the total amount of 8.0 to 13.5% by mass all relative to the total mass of the wire, and the amount of a metal fluoride is limited to 0.02% by mass or less (including 0% by mass).