... round screw 圆头螺钉 round seam 卷缝 round seaming 卷缝 ...
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pipeline round seam 管道环缝
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Size is expected to start from the calculation, cutting, straight seam welding, the whole round, press-fit, girth welding, leak detection, have a certain degree of technical difficulty.
从下料展开尺寸的计算、裁剪、直缝焊接、整圆、压装、环缝焊接、检漏等都有一定的技术难度。
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