MIG welding

MIG welding

This topic has 4 replies, 5 voices, and was last updated 25 October 2024 at 21:22 by Nicholas Farr.

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25 October 2024 at 19:03 #761173
Speedy Builder5
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@speedybuilder5
I have done a bit MIG in my time, but never made such a silly mistake as today. I just could not get a decent weld, changed the head of the torch, checked feed through, feed rates, gas etc.

Doh! Stupid me, I was holding the joint together with a strong magnet (Sea searcher recovery magnet) which was sucking the filler and hence arc all over the place!

Lesson learnt.

Bob
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25 October 2024 at 19:26 #761174
Clive Brown 1
Participant
@clivebrown1
I think that the magnet would have a direct effect by deflecting the arc itself as a conductor, not just via the filler wire.
25 October 2024 at 19:46 #761178
Fulmen
Participant
@fulmen
Correct. I used to work in a large electrolysis plant (3-400KA@48V DC if I remember correctly), the only way to weld was to use high frequency. And this was in the 90’s so I can imagine electronic inverters wasn’t exactly cheap.

That place was pretty wild, if you walked past the cells anything magnetic would dance around in your pockets like gerbils. Mechanical clocks would seize immediately and no amount of shielding would prevent CRT monitors from looking like a mushroom trip. And it would clean the magnetic strip of all your cards. That was always fun.
25 October 2024 at 21:06 #761195
noel shelley
Participant
@noelshelley55608
Yes ! Thats why it’s no good using those magnetic squares to hold an assembly together ! Noel.
25 October 2024 at 21:22 #761204
Nicholas Farr
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@nicholasfarr14254
Hi, I cant say I’ve ever had such a problem, but I’ve only used them for tacking up.

Regards Nick.
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