Recommendations for a long weld with no warping

[manicman]

Hi all,
I'm designing my own shot blasting cabinet and I've to weld (MIG) long runs (2ft ish) in 2mm mild steel, but I don't want any warping

Has anyone any suggestions as to how I could achieve this??

Thanks
ManicMan

 

[mfletch]

Do small welds at opposite ends and let it cool before you start welding again plus clamp a pease of angle close to the weling it will still distort though

 

[steveo3002]

cant you make a flange /change the design so its spot welded along a lip ?

surley the ready made ones are like that rather than seam welded?

 

[rtbcomp]

Do small welds at opposite ends and let it cool before you start welding again plus clamp a pease of angle close to the weling it will still distort though

Would you be better starting in the middle and working outwards. I reckon starting from the ends would cause a bulge in the middle.

 

[manicman]

cant you make a flange /change the design so its spot welded along a lip ?

surley the ready made ones are like that rather than seam welded?

Steveo,
I should have said.... Sorry.... I'm replicating some of the bigger units which are fully welded as I can't use a spot welded design due to not using a 'suction method' to clear the dust.... I built a smaller version years ago where I used a computer case fan to blow air in and the exhaust air runs through a baffle box to filter prior to venting outside - with a small foam sponge thingy as a filter... This way, you don't get any dust particles inside.

 

[Kent]

lots of tacks first off, weld all those joints downhill go half way and the turn it over and work downhill opposite etc. if you feel you need to but I doubt it. I actually doubt you will have big issues downhill as a corner to corner on 2mm with MIG doing each one full but take it easy get plenty tacks in and keep an eye on things as you go 2ft is nothing and 2mm will melt in just fine downhill

 

[dannyp]

thak it up well. on hoppers, trailer sides ect i just weld downhill fast after tacking it up thats usally 3mm 2mm on some shutes put it corner to corner and fly down the join job done