| 摘要 |
PURPOSE:To obtain a stable arc by providing electric conductive wear resistant material to an inside peripheral part of the tip of a welding port main body made of copper material on a welding port to prevent a tip part of the welding port from wearing. CONSTITUTION:A cover 5 made of copper is screwed on the tip part 4 of the welding port main body 1 and a reinforcing member (the electric conductive wear resistant material 6 having a through hole 6a for a weld line on the center is interposed and fastened between the inside tip part of the cover 5 and the tip of the tip part 4. Said reinforcing member 6 is constituted of a hard and electric conductive TiN-ZrN solid solution. By this method, the diameter dimensions of the through hole 6a for the weld line of the tip part of the welding port are prevented from being enlarged due to the wearing and the welding arc is not hindered from being generated.
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