工艺参数对板管间接点焊过程的影响

Effect of processinig parameters on sheet-tube indirect spot welding process

针对板管间接点焊过程中焊接变形较大,引起接头质量难以保证的问题。通过采集电极位移曲线,研究板管间接点焊过程中膨胀量和变形量的变化规律,分析不同焊接工艺参数(焊接电流、电极力和焊接时间)对该点焊过程的影响。结果表明,板管间接点焊焊接阶段,膨胀过程与变形过程相互耦合;保持阶段,在电极力作用下,焊接变形进一步加大,最大变形量随着电极力的增大和焊接热输入的增多而线性增加。发生喷溅时,电极位移曲线出现阶梯状畸变,可利用位移曲线斜率的变化评判该点焊的喷溅现象。研究结果为板管间接点焊过程在线监测与质量控制提供理论指导。

In sheet-tube indirect spot welding,it is difficult to assure welding quality because the welding deformation is too large.The expansion and welding deformation were investigated and the influence of different welding parameters(welding current,electrode force and welding time)on indirect spot welding process was analyzed through electrode displacement.The experiment result shows that the course of the expansion and welding deformation are coupled to each other in the welding stage;in the holding stage,welding deformation gets larger under the ailion of applied electrode force.Maximum welding deformation of sheet-tube indirect spot welding process is almost linear with electrode force and input welding energy.Ladder-type occurs in the electrode displacement curve when the expulsion happens,so the expulsion can be judged according to the slope coefficient of electrode displacement.The result provides a theoretical guidance for on-line monitoning and control of welding quality in sheet-tube indirect spot welding process.