hi
A method I used to use when I worked at the shipyards was this :-
where distortion has occured due to a straight weld, turn the item over then heat the back of the weld (oxy/prpane or oxy/acety) and as you move along the length of the weld cool it with water a couple of inches after the torch the metal then bends back toward the heat source effectively straightening it.... this is called heat line bending
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