X100管线钢四丝埋弧焊温度应力场的数值分析

采用ANSYS有限元软件,对X100管线钢的四丝埋弧焊的焊接温度场和应力场进行了模拟,研究了焊接电流、焊接速度、焊丝间距对焊接温度场和残余应力分布的影响。计算结果表明,当每根焊丝的电流增加50 A时,焊接温度场的峰值温度增加135 ℃,焊接热循环的冷却速度略有下降;当焊接速度从0.72 m/min增加到0.84 m/min时,焊接温度场的峰值温度下降183 ℃,焊后冷却速度明显增加;当焊丝间距由30 mm增加到50 mm时,焊接温度场的峰值温度下降189 ℃,焊后冷却速度增加。焊接电流增加50 A时,焊接残余应力水平略有增加;而增加焊接速度和焊丝间距时,残余应力峰值水平下降。

Numerical Simulation of Welding Temperature Field and Stress Field in the Four-wire Submerged Arc Welding of X100 Pipeline Steel

The welding temperature distribution in the four-wire submerged arc welding of X100 pipeline steel was simulated by using ANSYS finite element software. The influences of welding current, welding speed and inter-wire spacing on the welding temperature field and residual stress distribution were investigated. Results showed that an increase of 50 A in the welding current of each wire led to an increase of 135 ℃ in the peak temperature and a slight decrease in the cooling rate of the thermal cycle. When the welding speed increased from 0.72 m/min to 0.84 m/min, the peak temperature of the welding temperature field decreased by 183 ℃ and the cooling rate after welding was remarkably increased. When the inter-wire spacing increased from 30 mm to 50 mm, the peak temperature decreased by 189 ℃, and the cooling rate after welding also increased. The equivalent residual stress magnitude increased slightly when the welding current of each wire increased by 50 A, but fell down with an increase in welding speed and inter-wire spacing.