| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent generation of pits in a bead surface and generation of bead irregularity, undercut or the like by an inexpensive and simple method by using a mixed gas having the adequate mixing ratio of an argon gas, a carbon dioxide gas and an oxygen gas as the shield gas when performing the lap fillet welding of two galvanized steel sheets by using the laser welding and the arc welding in combination. <P>SOLUTION: A mixed gas consisting of an argon gas, a carbon dioxide gas and an oxygen gas is used for a shield gas, wherein the mixing ratio of the carbon dioxide gas and the oxygen gas is regulated in ranges to satisfy the inequalities of 3≤A≤25, 5≤B<13, and B≥10-0.33A, where A denotes the volume percentage of the carbon dioxide in the shield gas, and B denotes the volume percentage of the oxygen gas. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
