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Sept 26, 2009 22:58:32 GMT
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gotta weld a 3" disc into a flat panel, i can access
both sides easily, its a visible area, any tips ?
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Sept 26, 2009 23:06:16 GMT
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as low a setting as possible and do small 'stitch' welds, on opposing side of the disc. allowing slow(ish) cooling is also a bonus as its excesses in temperature that causes the distortion.
I hope thats helpful, and correct. I'm sure there are other welders on here significantly more able to give advice than i.
;D
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purplevanman
Posted a lot
Way too orangey for crows
Posts: 3,829
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Sept 26, 2009 23:07:18 GMT
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slowly  Get a steel or copper block and place on the back of where you are welding to suck out the heat. Tack 4 sides, tack between each tack, tack between each tack again, keep the block on the back with maybe a wet cloth to suck out the heat. Circles will distort less than a square patch so you are off to a good start patience dear boy |
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Gray
Part of things
Silence isnt golden!!!
Posts: 742
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Sept 26, 2009 23:29:04 GMT
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The best advice has been given but also gas up to about 20, amps way down. if your weld forms ballbearings up your amps but not your wire speed and spot it very quickly. it'll allow penetration without forcing to much wire in. also if your going to use a block to absorb heat use brass, itll leave the weld flat underneath, absorb heat and you cant weld it to your workpiece, most pro welders have a "welders brass" in their toolbox, we usually use it for hole filling but its good on light stuff If possible tig it  |
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Sept 27, 2009 0:15:47 GMT
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i've got a lump of copper about 8mm x 50mm x 200mm, i'll give it a go.
tig ? this is only the 3rd welding job i've done ! (left it late to learn, i'm 40 !)
thanks for the tips.
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Sept 27, 2009 1:16:18 GMT
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gotta weld a 3" disc into a flat panel, I can access both sides easily, its a visible area, any tips ? never mind the welding question Erick is dead?   . thats quite a shock. looked up the details; Norwegian Blue since Feb 4th RockinnReelininAucklandNewZealand version of Hot pearl snatch (here performed on The Tube) and goo goo muck evoke most memories anyway, back to the question.  i don't know the answer - but I'm intrigued to know where the hole is? bonnet?, roof?, or rear quarter LPG hole? |
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Someone just shot the elephant in the room. |
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Sept 27, 2009 7:36:46 GMT
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bulkhead to the back of the cab, vw caddy pick up mk1.
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Sept 27, 2009 9:37:36 GMT
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gonna need pics good luck |
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valman
Part of things
Posts: 603
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Sept 27, 2009 13:38:51 GMT
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what ive found helps is, if you put a slab of copper underneath the metal it absorbs the heat. sorry if its already been mentioned, didnt read above posts EDIT: read above posts and its been mentioned  ;D ;D very good advice guys! ima use those techniques too  |
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Last Edit: Sept 27, 2009 13:43:41 GMT by valman
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kabman
Part of things
Posts: 348 
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Sept 27, 2009 20:03:07 GMT
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I use a copper mallet if there's room for it. It's handy because it's got a built in handle. Weld a little at a time and dunk it in a bucket of cold water between welds. You can buy heat absorbing putty that you stick to the panel around the weld but a cheapo alternative I was shown is papier mache. I'm serious Mush up some soggy newspaper and make a ring around the area to weld. I've never tried it myself and I guess it could be tricky getting it to stay stuck to vertical panels though. Myself, I use a piece of 'pig mat' (we use it at work for absorbing spills). I cut a hole to fit round where I want to weld, soak it in water and plaster it to the panel. |
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;D ;D
