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in the spiral submerged arc welding (ssaw) process, also known as hsaw pipe, the weld is shaped like a helix. it uses the same submerged arc welding technique as lsaw pipe. the only major difference is that ssaw pipe is helically welded while lsaw is longitudinally welded. the manufacturing process is to roll the steel strip so that the rolling direction is at a certain angle to the direction of the center of the pipe, and then formed and welded, and the weld seam is a helical line.
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