The present invention relates to a pre-stressed steel sheet and a method a method of manufacturing the same.

An embodiment of the present invention provides a pre-stressed steel sheet comprising: a base material; and a plurality of weld lines formed on the base materials, wherein the average spacing between each pair of the weld lines is equal to or greater than five times the width of the weld lines and equal to or less than half the width of the steel sheet.

According to an aspect of the present invention, a pre-stressed steel sheet having improved bendability can be provided, and accordingly when the pre-stressed steel sheet is applied to a structural member such as a girder or beam, the bendability of a structure can be improved.

A first workpiece and a second workpiece respectively include a first joint portion and a second joint portion which extend linearly. Among the first joint portion and the second joint portion, the second joint portion includes a seating portion that abuts the first joint portion, and an overlapping portion inclined in a direction that moves away from the first joint portion. When joining is to be performed, first the seating portion is butted against the first joint portion, and then the overlapping portion is pressed toward the first joint portion by means of a pressing force applying means. In addition, laser light is radiated at parts of the first joint portion and the overlapping portion that are in proximity to one another.

A welding structure of a T-shape welding joint in which a second base material is welded in a T-shape to a first base material may include the first base material including a first flat portion, a second flat portion, and curved portions formed between the first flat portion and the second flat portion; the second base material in which a bent portion is formed at an end of a main body portion such that the bent portion is disposed to face the curved portions of the first base material; and a bead disposed between the curved portions of the first base material and the bent portion of the second base material.

A welded steel part obtained by welding a first sheet with a second sheet, at least one with a coating of aluminum alloy. The welding uses a welding wire which, after melting and cooling, constitutes a weld bead connecting the first sheet to the second sheet and being part of said welded steel part. The respective peripheral edge of the first and second sheets are in a joggled edge type configuration in which the peripheral edge of the first sheet is arranged above, and on or near the upper face of an end portion of the peripheral edge of the second sheet which is extended by an inclined junction portion, at least one part of the upper face of the inclined junction portion delimits at least laterally with the edge of the peripheral edge of the first sheet a groove receiving the weld bead, the inclined joining portion extending by a welding portion in longitudinal continuity with the peripheral edge of the first sheet.

Provided is a method and tool for butt welding a first material piece of metal to a second material piece of metal at opposed longitudinal edges. The second material piece has a greater material thickness than the first material piece. The first material piece has a higher tensile strength and/or a higher inching temperature and/or a higher yield strength and/or a higher modulus of elasticity than the second material piece. A thickened longitudinal edge is provided at the first material piece. The thickening of the longitudinal edge is at least partly produced by at least simple folding, beading or winding of the first material piece or at least partly by folding the first material piece at its edge. The two material pieces are friction-stir welded at their front along the opposed longitudinal edges.

In a preferred embodiment, there is provided a process for forming a reinforced rocker panel assembly, and which includes positioning a reinforcement patch having first and second patch sections in surface-to-surface contact with a blank panel sheet, and welding the first patch section to the blank panel sheet. The process further includes bending both the blank panel sheet and the reinforcement patch along a bend line interposed between the first and second patch sections to form the blank panel sheet into a rocker panel portion having an elongated base section and a longitudinal flange, where the first and second patch sections are in at least partial abutting contact with the base section and the flange. The process also includes welding the second patch section to the flange.

The disclosed apparatus, systems and methods relate to the design principles for forming a welded joint between two sections of tubing or pipe. The material at the end portion of a first section of tubing to is folded inwardly to create a support surface. This support surface improves the ability to weld light gage material with traditional arc welding and it creates conditions to allow brazing to be as strong as traditional arc welding by using A shaped piece of filler material which is located at the intersection between the support surface of the first section of tubing and a side wall section of the second section of tubing. While holding together the first and second sections of tubing with the filler material, heat is applied at the intersection at a temperature and for a duration sufficient to melt the filler material and form the 3t joint.

Discussed is an electrode lead bending and welding apparatus including a base portion movable in a vertical direction and a horizontal direction, a bending portion attached to the base portion and extending away from the base portion, and a sensing portion attached to the bending portion and rotatable; . A welding between an electrode lead and a busbar of a battery cell is performed in the state in which the electrode lead is bent by the bending portion, . Also discussed is an electrode lead welding method using the electrode lead bending and welding apparatus.

A tube used in a heat exchanger, wherein a tube body includes a curved end portion, a pair of parallel portions, a pair of inclination portions, and a fixed portion in which a long end part extending from one of the pair of inclination portions is bent to hold therebetween a short end part extending from the other of the pair of inclination portions, and the tube is a pipe member having a flattened shape in cross-section. Poor brazing is reduced by making the inclination angle of at least part of the other inclination portion with respect to the flat plate portion larger than that of the one inclination portion.

A process for manufacturing a muffler for an exhaust system of an internal combustion engine, provides a manufactured muffler with a muffler housing with a housing jacket (14) that is elongated in a direction of a housing longitudinal axis and with at least one housing bottom (26) carried on the housing jacket (14). The process includes the steps of providing the housing jacket (14) with a stop formation (50) in association with at least one housing bottom (26) to be carried on the housing jacket (14), providing the at least one housing bottom (26) to be carried on the housing jacket (14), and positioning the at least one housing bottom (26) on the housing jacket (14) such that the housing bottom (26) is in contact with the stop formation (50) associated with the housing bottom (26).