随焊冲击旋转挤压控制TC4薄板焊接失稳变形工艺

Control of buckling distortion of TC4 thin plate by impact revolution pressing during welding process

薄板钛合金在焊后存在较大的残余压应力,使其发生失稳变形,很多情况下,结构不能满足设计要求,必须采取措施减少失稳变形.文中采用随焊冲击旋转挤压的方式,对焊接过程中尚处于较高温度的焊缝部位进行塑性延展,减少焊接时发生的塑性收缩量,降低残余压应力的值,从而减少焊接变形量.对焊后薄板的变形挠度和残余应力进行了测量,变形挠度下降到原来挠度的1/8,并且随着加载时输入电压的提高,变形的挠度进一步下降.结果表明,在焊接过程中采用随焊冲击旋转挤压方式控制薄板Ti-6Al-4V失稳变形是可行的.

The welded residual compression stress which is larger than the compression residual stress can cause buckling distortion of TC4 thin plate in normal welding process.In order to decrease the buckling distortion,the method of impact revolution pressing during welding was utilized to gain plastic extension in the certain temperature zone of the welding bead.The residual stress can be reduced by compensating the plastic shrinkage in the zone.The experiment results show that the deflection can be decreased to one eighth of the original deflection by impact revolution pressing.Higher input voltage,more the deflection can be reduced.The method of impact revolution pressing in welding process is feasible to control the deflection of TC4 thin plate weldment.