Problem with welds distoring the steel

[performance]

They continoulsly weld a bead to the ibeam top side in mobile home plants to prebow the beams before they build the top to make sure everything is level when they are finished. Welding down the length of the tubing or ibeam will bow it. Welding across the tubing at a right angle to it, doesn't cause as much of an issue. When you build a trailer, that's something to keep in mind, when you hang your axles. Only weld the front and rear portion of the hanger. Welding down the side is not permitted in many places. The hanger manufacturers will tell you not to weld the hangers down the side as well as it is not necessary if it is properly welded.

[cbmkr]

They continuoulsly weld a bead to the ibeam top side in mobile home plants to prebow the beams before they build the top to make sure everything is level when they are finished. Welding down the length of the tubing or ibeam will bow it. Welding across the tubing at a right angle to it, doesn't cause as much of an issue. When you build a trailer, that's something to keep in mind, when you hang your axles. Only weld the front and rear portion of the hanger. Welding down the side is not permitted in many places. The hanger manufacturers will tell you not to weld the hangers down the side as well as it is not necessary if it is properly welded.

That's just the opposite of what we practiced.Our policy was no welding across the flange only weld with it's length, The understanding from a non engineering point was that in simple terms, The molecules in the steel rush from one end of the steel fabricated channel or tube to the other, to avoid a structural failure avoid adding extra material in there path as they will hit the spot where you have welded. Thus causing a possible fracture. This is the standard that we had in our plant. Most of our trailers were a minimum of 40,000 pound GVW and up to 80,000 pounds.Most of our Frame Rails were I Beam or Fabricated Channels Mfg by AO Smith 110,000 tensile strength. Taking for granted that small loaded pieces of structural steel will handle the weld across the flange. Not knocking you just adding what i learned years ago.