Join Date: May 2002
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Re: Weld it or bolt it?
I'm going to break the pattern and say not to weld them, Except:
If you choose to weld them do not make a full pass vertically on the frame rails. I have seen too many
frames fail at or near vertical welds on rails. If you can make a horizontal pass for the top and bottom,
then you would be OK.
Now I'm going to hear a load of, uh, "stuff" about how a weld is stronger than the original material,
my welds never break, bla bla bla. True statement(s) (possibly) by itself. However, most welds introduce
a stress riser adjacent to the weld. If not nomalized, or if something isnt done to move the stress off
the weld zone (gussets, bracing etc.), over time you wind up with a fractured frame. It even got me once.
There is a reason big truck frames are always stamped that welding is not allowed on them. To prevent
bad welding practices. Keep any welds on frames to a small crossection of the frame, or in line with
the stresses and strains placed on it.