emsfactory
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| posted on 8/9/08 at 11:08 AM |
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Minimise distortion during welding
Hi guys,
I am OK when it comes to welding and can now tig ally with reasonable results.
What I want to do though is to build a stainless tank and have no distortion. And then clean the welds.
How would you go about this?
Would the piece have to be clamped in a big heat sink or can you employ a welding style?
Any ideas would be appreciated.
Cheers.
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twybrow
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| posted on 8/9/08 at 11:43 AM |
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I think the technique is to do a series of stitches, allowing the metal to cool down in between. Don't go over an area for long, as the heat
build up causes the distortion. The theory sounds ok, but I had a nightmare trying to weld stainless!
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emsfactory
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| posted on 8/9/08 at 12:01 PM |
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Yeah i've tried that way too. I still get small ripples close to the weld though.
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IDONTBELEIVEIT
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| posted on 8/9/08 at 04:14 PM |
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hi mate,my company builds tanks in all materials,what size tank?and what thickness material are you planning on using,we use a facility on our tig
plants called pulse welding,basically you weld for a set time say three quarters of a second at full amperage then slopes down to a lower pre set
amperage for a set time say one second to minimise distortion while using aluminium chills either side of the weld which are just ali tooling plate
nice and flat to "suck" the heat from the weld area
regards wayno 
Are We There Yet, Are We There Yet!!!!
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emsfactory
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| posted on 8/9/08 at 06:09 PM |
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Thats more in line with what I was thinking.
I dont have a pulse welder though.
I am planing on making a sink out of 1mm. It will be about 1000 by 600 total and the sink about 500x550x300.
How thick would the heat sinks need to be?
Would they be on both sides of the sheets?
How close would you put them to the weld line?
Is is possible without an auto pulse welder? I do have foot pedal control.
Sorry about all teh Q's.
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IDONTBELEIVEIT
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| posted on 8/9/08 at 07:50 PM |
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the sinks we make are out of 16swg DP1 with pressed sink bowls with a spun out edge,the chills we use are 1/2" thick placed eitherside of the
weld on the top face and as close as you can,just enough for your shroud,yep possible without pulse welding called step back welding where you weld
say right to left 40mm or so and then start again 40mm on the right of where you started last time if that makes sense
Are We There Yet, Are We There Yet!!!!
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emsfactory
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| posted on 9/9/08 at 08:14 AM |
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Yep that all makes sense. What is DP1?
Cheers for the help.
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IDONTBELEIVEIT
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| posted on 9/9/08 at 04:33 PM |
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DP1 is stainless steel Dull Polished(grained) on 1 face
wayno!!
Are We There Yet, Are We There Yet!!!!
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emsfactory
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| posted on 9/9/08 at 04:40 PM |
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Cheers.
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