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采用直流CMT(DC CMT)与脉冲MIG(P-MIG)焊接方法分别对4 mm厚铝合金进行了堆焊与对接试验,并对接头的成形及微观组织进行了分析。结果表明,在相同线能量下进行堆焊试验,DC CMT焊焊丝的比熔化量明显大于P-MIG焊,DC CMT焊对母材的热输入量要大于P-MIG焊;在不同线能量下进行对接试验,DC CMT可以获得较P-MIG优良的接头,对装配间隙的要求低于P-MIG;观察微观组织,DC CMT焊较P-MIG焊焊缝中心晶粒细化,热影响区范围减小。分析堆焊与对接试验接头成形特点、微观组织区别,指出两种焊接方法的过渡形式及熔滴温度为其主要影响因素。
The 4 mm thick aluminum alloy was welded and docked by direct current CMT (DC CMT) and pulsed MIG (P-MIG) welding respectively. The forming and microstructure of the joint were analyzed. The results show that the specific melting amount of DC CMT welding wire is obviously larger than that of P-MIG welding under the same line energy. The heat input to DCMT welding is greater than that of P-MIG welding. Under different wire energy For the butt joint test, DC CMT can obtain better joints than P-MIG, and the requirement for assembly gap is lower than that of P-MIG. Microstructure, DC CMT welding is more refined than P-MIG welding center, Range reduced. Analyzes the forming characteristics and the microstructure difference of the welding and butt joint, points out that the transition forms of the two welding methods and the droplet temperature are the main influencing factors.