The preferred method is by oxy-acetylene flame.Heat tube first, beginning one inch from edge of valve.Sweep flame around tube in short strokes updown at right angles to run of tube.

 
  • 首先从离阀门1英寸的地方开始对管道进行加热,然后围绕着管道短距离上下交替对管道进行火焰烘烤,并以适当的角度旋转管道,避免烧穿管道。
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