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 structural member is provided that includes a steel sheet with a tensile strength of 980 MPa or higher overlying another metal plate and joined thereto by welding, where a break initiating near a welded portion is less likely to be produced. A structural member (10, 10a, 10b, 10c) includes: a first member (1), the first member being a steel sheet with a tensile strength of 980 MPa or higher; a second member (2) overlying the first plate (1), the second member being a metal plate; a plurality of welded portions (3, 31, 32); a plurality of heat-affected zones (5, 51, 52) each formed to surround the corresponding one of the welded portions (3, 31, 32), the heat-affected zones having a Vickers hardness lower than that of the first member by 50 HV or more. A pair of edge sections (4) of the first member (1) are provided between adjacent heat-affected zones (5, 51, 52). The pair of edge sections (4) of the first member located between the adjacent heat-affected zones (5, 51, 52) extend to cross a line (LC1) linking the adjacent welded portions (3, 31, 32).

To provide a metal bonded product wherein a large bonding area can be provided to achieve high bonding strength and coaxial accuracy can be easily achieved needing no positioning jig. A first taper portion 16 is formed on a side wall surface of the opening 13 of the ring-shaped metal member 12, and multiple step-shaped bonding surfaces are formed thereon. An end of the cylindrical portion 11 has a second taper portion 17 with the same chamfer angle as that of the first taper portion 16 of the ring-shaped metal member 12. The ring-shaped metal member 12 and the cylindrical metal member 11 are bonded to each other by press-fitting the cylindrical portion of the cylindrical metal member 11 in the opening 13 of the ring-shaped metal member 12 while applying a current to cause the side wall portion of the cylindrical portion of the cylindrical metal member 11 and the multiple step-shaped bonding surfaces of the first taper portion 16 to undergo plastic flow.

A turbine is provided comprising a plurality of stages, each stage comprising a rotatable disk and blades carried thereby, at least one pair of adjacent rotatable disks defining an annular gap therebetween and having respective opposing sealing band receiving slots aligned with the annular gap A sealing band is located in the opposing receiving slots to seal the annular gap Disk engagement structure is defined in the pair of adjacent rotatable disks. A clip member is coupled to the sealing band and engaged with the pair of adjacent rotatable disks through the disk engagement structure The clip member may have an aperture extending only partially through the clip member for alignment with a hole in the sealing band for engagement with a tool To improve weld geometry, the clip member may have angled surfaces and notched areas, and the sealing band may have chamfered edges.

The present invention provides a submerged arc welding method attempting to enhance toughness of a welded zone with low heat input and capable of achieving deep penetration and a sufficiently wide bead width in welding a thick material at a weld speed of 3 m/min or less. In the submerged arc welding method, a first electrode at the head in a welding direction has a wire diameter of 3.9 to 4.1 mm, two electrodes are arranged on both sides holding a weld line therebetween at the tail end in the welding direction, the wire tip positions of the two electrodes on a surface of the steel plate are arranged on the same line vertical to the weld line, and a distance W (mm) between each of the wire tip positions and the weld line is 5 to 20 mm.

An edge of each of a first metal member and a second metal member is formed to have a U-shaped cross section with a first horizontal plate projecting from a base edge of a vertical plate, and with a second horizontal plate projecting from a top edge of the vertical plate. The second metal member includes a projecting part. The joining method includes: an abutting step of forming an abutted part by abutting a front surface of the first horizontal plate the first metal member against a second side surface of the second metal member; and a joining step of performing friction stir welding of the first metal member and the second metal member by inserting a stirring pin from the projecting part and moving a joining rotating tool along an inner corner at the top edge of the vertical plate of the second metal member while making only the stirring pin in contact with the first metal member and the second metal member.

Reduced tube pitch within a shell-and-tube heat exchange reactor such as, for example, an EO reactor, is provided by utilizing a welding material that has a high tensile (i.e., a tensile strength of greater than 600 MPa). Reduced tube pitch allows for more elongated tubes (the tubes are filled with a catalyst) to be present in a reactor, and thus a smaller reactor can be manufactured. Notably, the use of a high tensile strength welding material allows the implementation of a small welding groove located between a beveled sidewall of a beveled upper portion of an opening provided in a tube sheet overlay material (that is located atop a tube sheet) and an outermost sidewall of the elongated tube passing through the opening in the tube sheet overlay material.

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).

Second member 20 includes a material that is difficult to weld to first member 10. In first member 10, recess 11 is formed by press molding such that a lower surface of first member 10 opposite to second member 20 protrudes.

Third member 30 is arc-welded toward at least a bottom of recess 11 via penetrating part 21 of second member 20. Second member 20 is compressed by flange 31 and first member 10 by solidification contraction of third member 30, and second member 20 is therefore fixed between flange 31 of third member 30 and first member 10.

Second member 20 includes a material that is difficult to weld to first member 10. In first member 10, recess 11 is formed by press molding such that a lower surface of first member 10 opposite to second member 20 protrudes.

Third member 30 is arc-welded toward at least a bottom of recess 11 via penetrating part 21 of second member 20. Second member 20 is compressed by flange 31 and first member 10 by solidification contraction of third member 30, and second member 20 is therefore fixed between flange 31 of third member 30 and first member 10.