how to reduce/eliminate plate warping due to excess welding heat 3

[koeskoes]

Hi,

We weld a 1/2 inch thick pipe vertically onto a 1/8 inch thin square plate. The plate is rolled to form a slight curve before we weld the pipe onto it. To eliminate liquid penetration, we made seamless weld and the excess heat causes the thin plate to warp/buckle. We have to spent many man-hours hammering the plates so that it would make a nice curve. Any ideas on how to elimate the wrap/buckle? we uses MIG with 0.04 wire.

Any ideas would be greatly appreciated.

koeskoes

 

[BillPSU]

Increase the thickness of the endcap to say 1/2", limit the fillet size to as small as possible, or bolt it to the pipe. Welding on one side of any plate will cause distortion. The thicker plate will reduce distortion and the smaller fillet will also reduce distortion, however there will be some distortion.

 

[Eltron]

Maybe try to "tack" it around in a couple of spots before you start your full fillet. I've found that this helps reduce drift or warping in other pieces I've delt with.

 

[Capntom]

Your problem is a common one. Thermal expansion on welded sheets. Anyway you look at it, to get penetration the plate is going to see in excess of 2000° F. Focus your efforts on the design if possible. Can you weld a smaller cap on the pipe then use small welds to secure the assembly to the plate?? A copper backing plate may aid in heat dissipation. How about friction weld or low temerature brazing/soldering??