MAGNUM MIG-MMA 220W IGBT Gas Flow Delay After Welding

Question

Hello. I just bought a MAGNUM MIG-MMA 220W IGBT migomat and noticed that after welding (the button was released), gas was still coming out for a good second or two. This is a waste of spot welding! Is it possible to accelerate the closing of the gas supply valve in this blinker? I would be grateful for your advice.

noopS · Answer

It is possible to change the value of a certain resistor in the RC circuit for the holding time of the solenoid opening. The question is whether you want to do it, because if you have a new device, you will lose the warranty

metallhead · Answer

So normal regulation - some potentiometer - does not have ?? Because it is annoying - such a delayed shutdown of this valve. I would not like to lose my warranty, but as long as you have patience, you can explain which resistor it is because if I finally get damned, I will have to do it!

noopS · Answer

You have to measure - I don't remember exactly which one.
But I processed such a migomat for the guy who welded the gratings and he wanted to quickly disconnect the gas after welding - so it is certainly possible

stasiekb100 · Answer

Insert photos of the board, I will tell you where to put the resistor.

Krzysztof Reszka · Answer

Think carefully. Any interference is a loss of warranty.

metallhead · Answer

@ stasiekb100 Is a photo on this side enough or on the other side too? I will post a better quality tomorrow. The two red wires are bent over from the solenoid valve. Added after 1 [minutes]: I know, I know, but maybe I'll have to make up my mind. Thanks for caring. Added after 12 [hours] 32 [minutes]: @ stasiekb100 now I put pictures of better quality if other photos are needed, it is enough to say.

stasiekb100 · Answer

Good pictures, I know this board, but in it I changed the igbt switch-off current, the gas always worked properly.

metallhead · Answer

@ stasiekb100 The gas can and works properly, but I am annoyed by the delay with which its supply closes after releasing the button in the handle. In my opinion it is way too big. With spot welding, it will practically come out all the time! And that is what I would like to avoid.

stasiekb100 · Answer

A 1k resistor between the source and the gate can be installed on the gas mosfet. If this does not help, something needs to be changed with the 358 amplifier.

metallhead · Answer

@ stasiekb100 and can you explain so more vividly in which place ??

patryk-84a · Answer

Rid up the topic. I have a question, how is this Mig doing for you? I am looking for an opinion from someone who has and uses it.

metallhead · Answer

The welder is working well so far, I am satisfied. For my homework, it is perfectly sufficient. I am only annoyed by the problem I wrote about at the beginning - I haven't rummaged in it yet.

MAGNUM MIG-MMA 220W IGBT Gas Flow Delay After Welding

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