Tandem gas-shielded arc welding method

摘要

A torch angle ¸ L of a leading electrode that uses a solid wire and a torch angle ¸ T of a trailing electrode that uses a flux-cored wire are respectively set in the following ranges: 5° ‰¤ ¸ L < 40° and 40° ‰¤ ¸ T ‰¤ 60°. A 100% carbon dioxide gas is used as a shielding gas for both the electrodes. In this state, a welding voltage V L and a welding current I L , which are welding parameters of the leading electrode, are respectively 26 to 38 V and 350 to 550 A, and the welding voltage V L in V and the welding current I L in A satisfy the following relationship: 56 ‰¤ (V L ·10 3 /I L ) ‰¤ 84.