利用该数学模型模拟焊接电流、弧长和焊丝伸出长度随时间的变化规律。
It is based on the mathematical model of GMA welding system and Halmoy's wire melting model.
我可能必须重新焊接管顶端的垂直领导管并增加一些长度为更多的步行刀片清除。
I may have to re-weld the top tube for vertical head tube and add some length for more foot to blade clearance.
但是由于焊接结构应力场的复杂性，使得精确计算拘束力、拘束长度和反变形量值很困难。
But, it is very difficult to calculate values of restraint, restraint length and reverse deformation accurately, because of the complication of stress fields in welded structure.
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