变电极力对管板单面电阻点焊质量的影响

根据管板单面电阻点焊结构特点,建立了采用伺服焊枪的管板单面电阻点焊试验系统.针对管板焊接过程中变形大、形成环形熔核质量不可靠等问题,提出了基于改变焊接过程中电极力来提高焊点质量的方法,并研究变电极力对管板焊焊点强度及焊接变形影响的规律.结果表明,通电阶段熔核生成初期减小电极力,可明显提高焊点拉剪强度,减小焊接变形;冷却阶段减小电极力对焊点质量也有所提高,但影响较小.研究结果对管板焊接工艺参数的制定及单面电阻点焊在车身焊装中广泛安全的应用具有重要意义.

Effect of electrode force on welding quality of sheet to tube by single sided spot welding

Based on the structure characteristics of sheet to tube joined by spot welding,a welding system with servo gun was established.Due to large deformation of the weldments dur-ing the sheet to tube welding stage and unreliable ring nugget af-ter welding,a new method was investigated to increase the weld quality based on the electrode force change.The effects of varia-ble electrode force on weld tensile-shear strength and weld de-formation were researched.The results show that the weld strength can be increased and weld deformation can be decreased by adjusting the electrode force in welding process.Comparative-ly,the change of electrode force during holding stage has less in-fluence on weld quality.The studies can contribute to develop welding parameters for sheet to tube joining and to promote the wider application of single sided spot welding in the assembly of auto body.