Qhov twg zoo dua, seamless lossis welded? Keeb kwm, cov yeeb nkab tau siv rau ntau lub hom phiaj. Tubing yog siv rau ntau yam kev siv xws li kev tsim kho, kev tsim khoom, thiab lwm yam. Thaum koj xaiv, xav txog seb cov yeeb nkab yog welded los yog seamless. Welded raj yog tsim los ntawm vuam ob ...
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