| 摘要 |
<p>A backing member provided on the rear surface of a material to be welded and used for backing in the penetration welding. Said backing member can be used repeatedly and for a long period of time in the penetration welding. A base material made of copper or copper alloy is provided at least on a side opposed to a welded portion and a copper aluminum alloy layer containing therein 9 - 23 wt% Al is formed on a surface of the base material.</p> |
