To provide a solid phase welding method and a solid phase welding apparatus which are possible to accurately control the welding temperature, to lower the welding temperature and to achieve a solid phase welding of the metallic materials. The present invention provides a solid phase welding method for metallic materials comprising, a first step of forming an interface to be welded by abutting end portions of one material to be welded and the other material to be welded and applying a pressure in a direction substantially perpendicular to the interface to be welded, a second step of raising a temperature of the vicinity of the interface to be welded to a welding temperature by an external heating means, wherein the pressure is set to equal to or more than the yield strength of the one material to be welded and/or the other material to be welded at the welding temperature.

The cold pressure welding apparatus includes a first holding part capable of sandwiching a first flat conductor, a second holding part disposed opposite to the first holding part and capable of sandwiching a second flat conductor, and a drive part for moving the first holding part and the second holding part. The drive part can move the first holding part and the second holding part between a first direction separated position and a close position along a first direction. The drive part can move the first holding part and the second holding part between a second direction separated position and a sandwiching position along a second direction.

Provided are a busbar unit and a method of manufacturing thereof configured to prevent an increase in resistance at a connection portion therebetween, to provide a good connection condition, and to easily achieve even a complicated wiring structure, in the case of connecting between a busbar and a pre-welded member (a terminal, another busbar, or the like) made of a metal material different from that of the busbar. A busbar unit includes a busbar made of a first metal material, and a welded member made of a second metal material to be connected to an end portion of the busbar. A welded portion between the end portion of the busbar and the welded member is configured by pressure welding between end surfaces butted against each other.

To provide a solid phase welding method and a solid phase welding apparatus which are possible to accurately control the welding temperature, to lower the welding temperature and to achieve a solid phase welding of the metallic materials. The present invention provides a solid phase welding method for metallic materials comprising, a first step of forming an interface to be welded by abutting end portions of one material to be welded and the other material to be welded and applying a pressure in a direction substantially perpendicular to the interface to be welded, a second step of raising a temperature of the vicinity of the interface to be welded to a welding temperature by an external heating means, wherein the pressure is set to equal to or more than the yield strength of the one material to be welded and/or the other material to be welded at the welding temperature.

A process for joining steel plate includes providing a steel plate and joining the steel plate to another material. The steel plate includes at least one surface having an AlSi coating. The step of joining the steel plate to another material is performed while the steel plate is in an as- coated condition. Joining is performed using a forging process.

The cold pressure welding apparatus includes a first holding part capable of sandwiching a first flat conductor, a second holding part disposed opposite to the first holding part and capable of sandwiching a second flat conductor, and a drive part for moving the first holding part and the second holding part. The drive part can move the first holding part and the second holding part between a first direction separated position and a close position along a first direction. The drive part can move the first holding part and the second holding part between a second direction separated position and a sandwiching position along a second direction.

The cold pressure welding apparatus includes a first holding part capable of sandwiching a first flat conductor, a second holding part disposed opposite to the first holding part and capable of sandwiching a second flat conductor, and a drive part for moving the first holding part and the second holding part. The drive part can move the first holding part and the second holding part between a first direction separated position and a close position along a first direction. The drive part can move the first holding part and the second holding part between a second direction separated position and a sandwiching position along a second direction.

To solve the problems of conventional wire billet butt-welding such as high labor intensity, potential safety hazards, and low production efficiency, the disclosure provides a wire billet butt-welding apparatus and a wire billet butt-welding method. The wire billet butt-welding method comprises: S1: preparing a stock, S2: rotating a butt-welding stock receiver to a stock receiving position, and feeding a first coil of wire billet to a stock receiving rod of the butt-welding stock receiver; S3: welding the first coil of wire billet and the second coil of wire billet on a rotary plate at the butt-welding position end-to-head; S4: rotating the butt-welding stock receiver and the second coil of wire billet to the stock receiving position; S5: rotating the stock receiving rod to rotate to tighten the wire billet between the first coil of wire billet and the second coil of wire billet; and S6: repeating steps S3 to S5 to complete butt-welding operations on the 3.sup.rd to n.sup.th coils of wire billet sequentially. The solution implements semi-automated butt-welding operation; with provision of the rotary plate and the butt-welding stock receiver, enables automatic loading, automatic flipping, and automatic discharging, which reduces the manual workload, lowers the safety hazards, and improves the production efficiency.

A method for making a face guard for use in a ball game includes: providing a specific material; annealing the material by first maintaining a temperature between 410 and 430? C. for 3 hours and then lowering the temperature by about 30? C./hour; cutting the annealed material into a main-body member and plural supporting members; butt-joining the two ends of the main-body member by applying a specific pressure to the two ends; welding the supporting members to the main-body member to form a face guard body; performing a T4 heat treatment on the face guard body by first maintaining a temperature between 450 and 550? C. for 1.5 hours and then quenching for 7 seconds; performing a T6 heat treatment on the face guard body by first maintaining a temperature between 100 and 120? C. for 24 hours and then cooling by air; and performing an anodizing surface treatment on the face guard body.

A welding method of a diffusion bonded structure in which the diffusion bonded structure formed by diffusion bonding metal parts to each other is bonded to another part by fusion welding includes a buffer layer forming step of forming a buffer layer in a welding region including a diffusion bonded joint of the diffusion bonded structure, the buffer layer having greater ductility than the diffusion bonded joint, and a welding step of bonding the welding region in which the buffer layer is formed to the another part by performing the fusion welding from above the buffer layer.