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Adjusting welding heat by length of arc ?

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Bill

03-14-2001 20:24:30




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Alright , this is for you professionals again. I am using a lincoln buzz box ac/dc welder with the tap settings. It seems that as I either lenghten or shorten the arc gap it affects my welding heat. Now don't get me wrong , I seem to be using this to my advantage as I continually strive to control the welding puddle and heat, but the question is does any one have an idea of the amount of heat control this does or does not produce. Just curious. Puddle control and heat control seems to be the ticket, just like balanceing on a basketball, what fun it is.

Bill

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T_Bone

03-14-2001 21:46:58




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 Re: Adjusting welding heat by length of arc ? in reply to Bill, 03-14-2001 20:24:30  
Hi Bill, varying arc length will cause a temperature difference with a longer arc being cooler but weld puddle control also deminishes at this longer arc length and a very poor weld contour will result with added splatter. The best overall control will be a very short arc length to a point where the rod tip and weld puddle looks to be one. You can dip the rod into the puddle to far and then the problems multiply greater than with to long of arc length and weld contour really deminishes. As a welders ability improves, you will find your best welds will come from a constant arc length at a higher heat setting. A good example would be to watch a semi-automatic welding process where the arc length is stable.

Speed of electrode travel is the only way to control heat of the weld puddle.

While teaching I used a demonstration where I let the elctrode weld by it's self. I did this by bending a long radius into the electrode, start the rod then layed down the electrode holder and let the rod weld by it's self. Makes a very nice bead. If you observe the rod tip and weld puddle you will see when the rod tip and puddle become one and that is what you want to strive for.

Bad habbits in welding are very hard to break so it's best not to start them.

T_Bone

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Brian G. NY

03-15-2001 07:54:29




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 Re: Re: Adjusting welding heat by length of arc ? in reply to T_Bone, 03-14-2001 21:46:58  
T_Bone, That reminds me of the "welds by itself" demonstrations the Forney salesmen used back in the 50s when they were making their rounds selling welders to farmers. They sold my dad one; he had never welded before in his life. He built so many things over the years that he got real good at welding. I have a '64 model Forney 180 Amp AC welder very similar to the one they sold my dad. I'm far from good at welding, but this thing (all copper wound) has been great for me and I only paid $50. for it back in '70.

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