【摘要】 采用ANSYS有限元软件计算分析了HQ130高强钢焊接接头区拘束应力的分布。计算和分析结果表明 ,在气体保护焊线能量 16kJ cm条件下 ,HQ130钢焊缝表面的瞬时拉伸拘束应力最大达到 80 0～ 10 0 0MPa ,焊缝底部的瞬时拉伸拘束应力达到5 0 0～ 6 0 0MPa。熔合区附近的应力梯度较大 ,这是高强度钢熔合区部位容易产生冷裂纹的重要原因之一。通过严格控制焊接线能量能减小焊接区的热应力 ,可防止焊接裂纹的产生。更多还原

【Abstract】 The distribution of the restrain stress in the welded joint zone of HQ130 high strength steel was researched by means of the ANSYS finite element method (FEM).The calculation results indicated that the instantaneous restrain stress on the surface of the weld of HQ130 steel reached 800～1 000 MPa,the instantaneous restrain stress at the bottom of the weld reached 500～600 MPa,under the condition of the gas shielded arc welding and heat input 16 kJ/cm.The stress gradient near to the fusion zone was larger.This is one of the important reasons that result in cold cracks at the fusion zone of the high strength steel.The thermal stress in the welded joint zone can be decreased by controlling welding heat input,and can prevent the welding cracks.更多还原