weld cracking 1

[bluntforce]

trying to find literature for one of the welders in the shop to help him understand why he should not weld across the grain of 2x2x1/4 steel tubing. there are caster plates( 4 ea.1/8" thick 3"x6" steel) that is centered on the tubing and flush to the end, underneath the tubing. after I gave him a dwg of the weldment w/ specs indicating I wanted (3) 2" welds on both sides evenly spaced running paralell w/ the tubing, he elected to weld under the tubing ,across the grain. this frame is 3' wide and the casters are 10" away from support columns.the frame will hold appx. 700-1200 lbs.
any help would be appreciated.

 

[metengr]

bluntforce;
The issue in my mind is if the welder placed the fillet welds on the very end of the tube or castor plate (rolling direction) , where lamellar tearing can ocurr in service. I have no technical problem with depositing weld metal across the grain (transverse to the rolling direction of the tube), so to speak.

 

[bluntforce]

metengr,
for the question of the weld location, yes the weld was placed at the end of the tubing/caster plate. the casters are v-groove and all (4) swivel.but the travel direction is perpendicular to the 3' dim of the weldment.wont the weight from the equip. cause the tubing to stress and fail at the weld location over time? "x's" represent welds? thanx
------------------|4"
____________|_____________________________
x____________x________________________2"
|
--------6"--------|

 

[metengr]

bluntforce;
After seeing your sketch above, I would perform the following;

1. remove the one weld on the very end by grinding it off.

2. Add two fillet welds on each side of the caster plate running parallel to the tube. You do not need to deposit the fillet welds for the entire length, I would go the necessary distance to carry the applied load using a 3:1 safety factor.

 

[bluntforce]

metengr,
Thanks for the advice.sorry about the sketch quality. kinda had to throw something out there, glad you could decipher it well enough.


thanks,
BluntForce

 

[GRoberts]

It is not generally a problem to weld perpendicular to the grain. You generally do not want your welds to be going perpendicular to the stress if they are causing stress risers though.

 

[bluntforce]

thanks for the info.


thanks,
BluntForce