| 摘要 |
PROBLEM TO BE SOLVED: To prevent the coarsening of crystal grain and to obtain a joining part excellent in joined strength, closeness and corrosion resistance by using CO2 gas or mixed gas of Ar and CO2 as shield gas and executing MIG welding or MAG welding. SOLUTION: Steel plates to be welded, applied with Al base plating, are lapped and a fillet welding to this lapped portion on is executed with a welding torch. As the shield gas at the welding time, CO2 gas is used. Further, as the shield gas at the MAG welding time, the mixed gas of Ar and CO2 is used. As the shield gas, it can be used to either gas, but in order to reduce the spatter as less as possible, the mixed gas of Ar and CO2 is better to use than CO2 gas. Further, in the mixed gas of Ar and CO2, the composition between both is particularly no problem but Ar gas mixing CO2 gas in 10-30% is desirable for stabilizing the arc and reducing the spatter.
|
