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通过对埋弧焊及活性气体保护焊在不同规范、不同板厚、不同坡口形状及不同预热温度下的焊缝熔合区不同位置热循环的测定,了解和探讨了诸因素对焊接热循环及T_(8/5)r的影响规律。在此基础上,对传统的Rosenthal有限板厚点热源准稳定温度场解析式进行了修正,提出了热源位置应与焊缝横断面最高温度相对应、计算的反射级数应为1左右等新的看法,并确定了适用于低碳低合金钢计算的导温系数,同时解决了不同预热温度、不同坡口形状下的热循环计算。经过修正,计算的热循环曲线与实测曲线吻合较好。
Through the determination of the thermal cycles at different positions of the weld zone in submerged arc welding and active gas shielded arc welding with different gauge, different plate thickness, different groove shape and different preheating temperature, the factors affecting the welding thermal cycle And T_ (8/5) r influence law. On this basis, the analytical solution of the quasi-steady temperature field of the traditional thick-point heat source of Rosenthal finite element is modified. The position of the heat source should be corresponding to the maximum temperature of the cross-section of the weld. The calculated reflection order should be about 1 , And the thermal conductivity coefficient which is suitable for the calculation of low carbon and low alloy steel was determined. Meanwhile, the calculation of thermal cycle under different preheating temperature and different groove shape was solved. After correction, the calculated thermal cycle curve is in good agreement with the measured curve.