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Old 02-28-2020, 10:45 AM
JavaKing JavaKing is offline
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Default flux core welder copper

I have a flux core welder and need to weld a 3/4 copper pipe. I do know that most people say no to this type of welder, but this is all I have to work with, know other way. Is there a wire that I could try that might just get me threw this time.
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Old 02-28-2020, 11:10 AM
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Why not solder??
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Old 02-28-2020, 11:14 AM
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Why not solder??
Because it won't feed properly thru the flux core wire feed welder ?...
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Old 02-28-2020, 11:30 AM
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Silver solder might feed
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Old 02-28-2020, 11:54 AM
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I would use silver solder and silver solder flux. Shine up the copper pipe to get a good bond. The weld is stronger than the copper pipe. Use a propane torch for the heat as silver solder requires higher heat than standard solder. I know of no way to use a flux core welder to weld copper pipe.
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Old 02-28-2020, 12:31 PM
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Quote:
Originally Posted by milomilo View Post
I would use silver solder and silver solder flux. Shine up the copper pipe to get a good bond. The weld is stronger than the copper pipe. Use a propane torch for the heat as silver solder requires higher heat than standard solder. I know of no way to use a flux core welder to weld copper pipe.


Hmmm, wonder if the welder could be used to heat the pipe to melt the solder? Basically no wire at all in the welder, and short out the gun tip to the copper pipe with the ground clamp attached to the pipe, and pull the trigger. Might sacrifice a tip, but might work, if the welder can hold the output.




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Old 02-28-2020, 12:37 PM
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Quote:
Originally Posted by milomilo View Post
...I know of no way to use a flux core welder to weld copper pipe...
Yup, that's a non-starter, plain and simple. Properly cleaned and prepped all you need to join copper pipe is regular solder. Because of cost copper pipe and fittings are not as common now but for many years they were the "standard" for most plumbing applications...
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Old 02-29-2020, 08:46 AM
JavaKing JavaKing is offline
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Default Flux core

Quote:
Originally Posted by milomilo View Post
I would use silver solder and silver solder flux. Shine up the copper pipe to get a good bond. The weld is stronger than the copper pipe. Use a propane torch for the heat as silver solder requires higher heat than standard solder. I know of no way to use a flux core welder to weld copper pipe.
I was going to use map gas but would not get pipe hot enough to melted the silver copper brasing wire pipe is copper refrigerant line OD 1 inches
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Old 02-29-2020, 08:54 AM
JavaKing JavaKing is offline
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Quote:
Originally Posted by digger doug View Post
Because it won't feed properly thru the flux core wire feed welder ?...
If I could find a flux wire for shielding and haves a copper
Silver wire and first heat pipe with map gas
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Old 02-29-2020, 08:57 AM
JavaKing JavaKing is offline
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Quote:
Originally Posted by digr View Post
Why not solder??
Will not hold pressure on a 1 inch OD refrigerant line
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