RESISTANCE SPOT WELDING METHOD OF AL-MG ALLOY

摘要

PURPOSE: To realize the resistance spot welding difficult to be deposited, capable of improving the service life of an electrode, and capable of the robot welding in mass production, in particular, of automobiles, etc. CONSTITUTION: The Al-Mg alloy has the composition consisting of, by weight, =2% to 5% Mg, =0.7% one or more kinds of Si, Fe, Cu, Mn, Cr, Zn, Ti, B, Zr, Ni, Mo, V, Sc, the rare earth metal, and the misch metal, and the balance Al with inevitable impurities. Welding is achieved on materials 1,2 where the thickness is 0.7-1.4mm, and the thickness of the oxide film on the surface is 40-150 with the welding current of 20-27kA by a single phase welding equipment, the energizing period of 2-8 cycles at 50Hz or 3-9 cycles at 60Hz, and the pressure of 300-400kgf using electrode 3, 4 where the conductivity is =90%IACS, the hardness is =HV80, and the shape is of circular-type of 20-80mm of radius.