Is this DOM or EWS tubing
03-15-2012, 12:23 AM
#3
I know it as erw electrical resistance welded. It leaves behind a fin of metal on the inside that will cut your finger. Tubes fail there so thats why DOM is used. I can 't tell if that is erw because I see the lines but they look flat. I would say if there is a peak its ERW. If it is as smooth as the rest of the inner diameter its DOM. Any other opinions? Just a FWIW..I bought some DOM mild steel 1020 or whart ever it is called and it was from india. I had some left over that was from the USA. The USA DOM was harder to cut. I though this stuff was supposed to have standards as 1020 DOM period. Byer beware I swear there are differences even if there is not supposed to be.
03-15-2012, 12:38 AM
#4
Racer
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DOM and ERW tubing both start out a flat sheet, formed and the welded, afterwards what makes DOM different it that it is pulled thru
dies which make it more round and slightly smaller each time it is pulled (drawn) thru a die until it is at the desired diameter, which basically it is cold worked , the grains are lined up etc...makes it stroner, the seam become almost invisible. if you notice the coating ont he tube is the dry lubricant that was on the tube when it went thru the dies or AKA mandrels....
True seamless tube is cast pipe, and most likely will crack when you try to bend it.
dies which make it more round and slightly smaller each time it is pulled (drawn) thru a die until it is at the desired diameter, which basically it is cold worked , the grains are lined up etc...makes it stroner, the seam become almost invisible. if you notice the coating ont he tube is the dry lubricant that was on the tube when it went thru the dies or AKA mandrels....
True seamless tube is cast pipe, and most likely will crack when you try to bend it.
