| 摘要 |
PROBLEM TO BE SOLVED: To provide a welding method which does not form pores and pits by zinc vapor from a heat affected zone region adjacent to a molten pool of the lap zones of base metals in spite of a lap joint of galvanized steel sheets or primer coated steel sheets. SOLUTION: In fillet welding of the galvanized steel sheets or primer coated steel sheets, a TIG arc oscillating at a high speed is used and welding conditions including such an arc current value and welding speed to melt the welding surfaces of the base metals 1a and 1b constituting a joint and not to melt the corner of the joint are adopted; in addition, an adding wire 6 is fed from a welding progression direction along the corner of the base metals toward the molten pool and while a molten metal is formed, a gap is formed in the corner of the joint near the molten pool by the wire 6 and the base metals 1a and 1b and the welding is performed while the zinc vapor produced on the base metals near the heat affected zones of the base metals is released outside from this gap.
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