我公司制造挖掘机的中厚板件的传统焊接工艺是,采用焊丝直径为φ1.6mm的混合气体(80％Ar+20％C0_2)保护焊。它的优点是:在CO_2气体中加入氩气(Ar)能改善焊接熔池形状,提高熔滴过渡的稳定性,减少焊缝中气孔,以及改善焊缝熔深形状和外观成形。由于φ1.6 mm焊丝的直径较大、焊丝的熔化率较高,因此,用φ1.6mm焊丝焊接的效率较高。但该工艺的缺点 The traditional welding process of the plate-making parts of excavators made by our company is to use the mixed gas (80% Ar + 20% C0_2) with a wire diameter of φ1.6mm to protect the welding. Its advantages are: Addition of argon (Ar) to CO 2 gas can improve the shape of weld pool, improve the stability of droplet transfer, reduce the porosity in weld, and improve weld penetration shape and appearance. As φ1.6 mm wire diameter larger, higher melting rate of the wire, therefore, φ1.6mm wire welding with higher efficiency. But the shortcomings of the process