Butt welding apparatus, butt welding method, and butt welded product

Abstract

Disclosed are a butt welding apparatus, a butt welding method, and a product manufactured by the butt welding method. Two electrode rollers (3, 4) are disposed on both the front and back sides of a thick sheet member (1) and on both the front and back sides of a thin sheet member (2) whose end surfaces (1A, 2A) are butted. The electrode rollers (3, 4) are applied with power, melt the butt portion (6) of the sheet members (1, 2) with electric resistance heat, and joint the butt portion. Further, the electrode rollers (3, 4) have a length bridging across the sheet members (1, 2) and are composed of first portions (3A, 4A) arranged as small diameter portions on the side of the thick sheet member (1) and second portions (3B, 4B) arranged as large diameter portions on the side of the thin sheet member (2). The first portions (3A, 4A) come into contact with the thick sheet member (1) and presses it before the second portions (3B, 4B) come into contact with the thin sheet member (2). Thus, the end surface (1A) of the thick sheet member (1) swells and deforms toward the thin sheet member (2) and reliably comes into contact with the end surface (2A) of the thin sheet member (2). As a result, power is applied between the end surfaces (1A, 2A) even if the end surfaces (1A, 2A) are not finished by polishing and the like.

Description

BACKGROUND OF THE INVENTION [0001] 1. Technical field [0002] The present invention relates to a butt welding apparatus for and a butt welding method of melting and jointing a butt portion where end surfaces of two welding sheet members are butted to each other with electric resistance heat generated by power applied between a pair of two electrode members, and to a butt welded product manufactured by the butt welding method. [0003] 2. Background art [0004]FIG. 21 shows a conventional butt welding apparatus. Two welding sheet members 101, 102 having the same thickness are set to the welding apparatus with end surfaces 101A, 102A butted to each other. Each of electrode rollers 103, 104 disposed on both the front and back surface sides of the sheet members 101, 102 has a thickness bridging across the sheet members 101, 102, and power is applied between the electrode rollers 103, 104 when the sheet members 101, 102 are welded. When the power is applied between the electrode rollers 103,...

AI Technical Summary

Benefits of technology

"The present invention is a butt welding apparatus for joining two sheet members together. The apparatus includes a pair of electrode members that are pressed onto the sheet members to securely melt the butt portion of the sheet members. The electrode members have press portions that press the sheet members in the thickness direction, causing the end surfaces of the sheet members to swell and deform towards each other, ensuring a reliable contact state between the sheet members. The apparatus can be used with different thicknesses of the sheet members and can be easily adjusted for different butt states. The technical effects of the invention include reducing the job cost and working time, and improving the quality of the welded joint."

Problems solved by technology

Therefore, conventionally, welding sheet members, for example, sheared in predetermined sizes by a shearing apparatus cannot be butt welded in a sheared state and must be subjected to finish processing to the end surfaces 101A, 102A prior to a welding operation, which increases a working cost and a working time.

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