A reliable way to improve the quality of spiral pipe was the substitution of high frequency butt welding for HF lap welding.
高频对焊代替高频搭焊是提高中直径螺旋焊管质量的可靠途径。
A reliable way to improve the quality of spiral pipe was the substitution of high frequency butt welding for HF lap welding.
高频对焊代替高频搭焊是提高中直径螺旋焊管质量的可靠途径。
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