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Welded steel tubes for the best way to

Welding seamless steel tube first cleanup clean welding of oil, paint, water, rust,, then according to wall thick open slope mouth, thick of on open big some, thin of on open small some (angle mill machine), then is on products of gap, General is electrode or wire diameter of 1-1.5 times times, if you slope mouth not carefully open big has words can appropriate left small some. Tack weld at least three, four good work in General.
   when welding seamless steel tube welded should be half and half, starting the best over most points at the end of about one centimeter, as well from the opposite connectors. If the pipe wall thickness, layer, at least two floors, the first complete finished welding can weld second-tier.

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