| 摘要 |
PURPOSE:To prevent a welding crack and the transfer of a bead trace by containing a Zn Mg, Cu, Cr, Ti and B at a specific wt.%, adding more than one kind of Zr and Mn of a specific % and making the balance Al. CONSTITUTION:The composition of an Al alloy filler metal contains 3.0-8.0(wt.% is same on the rest)% Zn, 0.5-5.0% Mg, 0.3-3.0% Cu, 0.05-0.35% Cr, 0.001-0.2% Ti, 0.0001-0.01% B and the balance is formed with Al and impurities. More than one kind of 0.01-0.4% Zr and 0.01-1.0% Mn is added further, if necessary. The Zn, Mg, Cu in the components act as a strength improving element all together, Cr improves the corrosion resistance and Ti, B refine the crystal grain. Zr, Mn improve the welding crack resistance and corrosion resistance. A welding crack and the transfer of a bead trace are thus prevented. |
