采用高速双丝熔化极活性气体保护电弧焊(MAG)焊方法对Q235板材进行焊接,研究了主/从焊丝所接焊接电源设置不同电流时对焊接接头组织与性能的影响.结果表明:电流的不同设置,影响焊缝区组织和热影响区(HAZ)微结构,并影响焊接接头强度和硬度.当主从丝电流设置成无差异时,双丝电极之间的电弧干扰最严重,电弧特性极其不稳定;随着双丝电极之间的电流差异增大,伴随微结构发生变化,热影响区域的硬度逐渐增大;当主从丝电流差值的绝对值继续增大到一定范围,热影响区域的硬度开始出现大幅减小,HAZ宽度增大.试验统计结果表明:在主从焊丝两路焊接电源采用反相位脉冲电流,主从焊丝被交替引燃,主丝焊接电流不大于从丝电流20 A时,电弧间干扰小,电弧稳定,可以得到理想的硬度,焊缝尺寸和微结构.
The welding of Q235 steel plates was carried out by anti-phase synchronized synergic-pulsed twin-wire M AG welding (MAG) method and the effect of the lead-trail wires welding currents in different configuration on properties and microstructure of the welded joints was investigated.The results show that the difference of the lead-trail welding currents affects the microstructure,strength and hardness of the welded joints.When there is no difference between the lead-trail welding currents,the arc interference of the two electrodes is the most serious.With the increasing of the currents difference,the change of microstructure will affect the hardness and width of the heat affected zone (HAZ).If the current difference is greater,the hardness of the HAZ decreases and the HAZ width increases.The experimental results show that at pulse-pulse hybrid power combination,two welding wires pulse presented alternative ignition in negative phase.When the current of the lead wire is higher than that of the trail wire in a range of 20 A,the arcs interference is relatively small and the arcs is stable,and the optimal hardness,weld size and microstructure of the welded joins are obtained.
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