WELDED STRUCTURE OF BOILER HEAT TRANSFER TUBE AND WELDING METHOD

To provide a welded structure of a boiler heat transfer tube and a welding method each of which allows for reduction of risk of crack propagation toward a heat transfer tube side.SOLUTION: The present invention is the welded structure of a boiler heat transfer tube in which another member (2) is joined to a boiler heat transfer tube (1) by welding, and in which unwelded parts (5a) are provided along predetermined distances from both ends of the other member (2). The present invention is also the welding method of the boiler heat transfer tube in which the other member (2) is joined to the boiler heat transfer tube (1) by welding, and in which unwelded parts (5a) are provided along the predetermined distances from both ends of the other member (2), and the other member (2) is welded to the boiler heat transfer tube (1).SELECTED DRAWING: Figure 1 【課題】伝熱管側への亀裂の進行リスクを低減することができるボイラ用伝熱管の溶接構造および溶接方法を提供する。【解決手段】本発明は、ボイラ用伝熱管（１）に他部材（２）を溶接により接合するボイラ用伝熱管の溶接構造であって、他部材（２）の両端部からそれぞれ所定の距離だけ未溶接部（５ａ）が設けられていることを特徴とする。さらに、本発明は、ボイラ用伝熱管（１）に他部材（２）を溶接により接合するボイラ用伝熱管の溶接方法であって、他部材（２）の両端部からそれぞれ所定の距離だけ未溶接部（５ａ）を設けて、他部材（２）をボイラ用伝熱管（１）に溶接することを特徴とする。【選択図】図１