The residual maximum main stress (σmax) of vibratory submerged-arc welding (SAW) under different parameters was studied by means of experiments and mathematical modeling.The results show that when the welding heat input is 22.8kJ/cm,σmax will be reduced evidently as the acceleration increases.The lowest σmax is obtained when the welding heat input is 26kJ/cm and acceleration 10m/s2.While heat input increases to 31.6kJ/cm,σmax distinctivly decreases under the acceleration of 15m/s2.

The correlation curve of σmax related to heat input residual and acceleration was got through multi-variant nonlinear regression analysis.The optimal vibratory welding parameters were established. Heat input ranged from 22.8～32kJ/cm with acceleration from 10～15m/s2 favors σmax reduction.

采用试验分析、数理统计的方法研究不同参数下的振动埋弧焊残余最大主应力（σmax）。结果表明：在较小焊接热输入（22.8kJ/cm）下,σmax随着振动加速度的增大而减小,且趋势明显;在中等焊接热输入（26.6kJ/cm）下,σmax在10m/s2的振动加速度下残余应力最小;而对于较大焊接热输入（31.6kJ/cm）,σmax也较大,只有振动加速度达到15m/s2时σmax才有明显下降。建立了焊接热输入、振动加速度与残余最大主应力的相关性关系曲线,确定了以降低残余应力为主要目标的最佳工艺参数,认为焊接热输入在22.8～32kJ/cm范围时,振动加速度选取在10～15m/s2范围内,可获得较低的残余最大主应力。

振动焊接, 热输入, 残余最大主应力, 回归分析

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