WELDING METHOD OF HEAT TRANSFER COPPER FIN FOR METAL CASK AND METAL CASK WITH HEAT TRANSFER COPPER FIN

PROBLEM TO BE SOLVED: To provide a welding method of heat transfer copper fin for metal cask excellent in welding property of foreign matter joint between copper and steel.SOLUTION: A welding method of a heat transfer copper fin for a metal cask is characterized in that, when the minimum distance from a molten bottom part of the heat transfer copper fin side to a weld bead surface is set as a throat thickness of a welded part, a wire weld cross-section is determined from a wire feeding speed or the wire feeding speed and a wire diameter, and a prescribed welding speed so that the throat thickness with a predetermined size or greater is formed, a CuSi wire is used for a weld line at every path to be welded from a weld starting position to an ending position of each fillet joint part and weld construction is performed at every one path by a composite welding of preceding TIG and subsequent MIG or MIG welding. 【課題】銅と鋼との異材継手の溶接性に優れた金属キャスク用伝熱銅フィンの溶接方法を得ること。【解決手段】本発明の金属キャスク用伝熱銅フィンの溶接方法は、上記課題を解決するために、伝熱銅フィン側の溶融底部から溶接ビード表面までの最小距離を溶接部ののど厚とした時に、前記のど厚が所定の大きさ以上に形成されるようにワイヤ送り速度又は該ワイヤ送り速度とワイヤ径及び所定の溶接速度からワイヤ溶着断面積を決定し、かつ、各隅肉継手部の溶接開始位置から終了位置まで溶接すべきパス毎の溶接線に対して、ＣｕＳｉワイヤを用い、先行ＴＩＧと後続ＭＩＧとの複合溶接又はＭＩＧ溶接によって１パスずつ溶接施工することを特徴とする。【選択図】図６