SAW Pipes & saw tubes     

 

  SAW Pipes & SAW Tubes: This process is used for pipes from 24" to 36" i.e 610mm to 914mm OD. Flat plate is first pressed into U and later O shape. The O shape is placed in an automatic welder and backed up on the inside by a water cooled copper shoe. Two electrodes in close proximity and used. The electrodes are not in actual contact with the pipe. The current passes from on electrode through a granular flux and across the gap in the pipe to the second electrode. The high temperature of the arc heats the edges of the plate, a welding rod placed just over the seam is thereby melted and metal is deposited in the groove. After the outside weld has been made, the pipe is conveyed to an inside welder where a similar operation is carried on, except that no backup shoe is need.  

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