logo elektroda
logo elektroda
X
logo elektroda
Advanced Search
logo elektroda

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

metallhead 8064 13
ADVERTISEMENT
Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
Report a violation of the law
Reply | New topic
  • #1 17348791
    metallhead
    Level 10  
    Posts: 7
    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.
    MAGNUM MIG-MMA 220W IGBT Gas Flow Delay After Welding
  • ADVERTISEMENT
  • #2 17351953
    noopS
    Level 18  
    Posts: 229
    Help: 23
    Rate: 29
    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
  • ADVERTISEMENT
  • #3 17352652
    metallhead
    Level 10  
    Posts: 7
    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!
  • #4 17352673
    noopS
    Level 18  
    Posts: 229
    Help: 23
    Rate: 29
    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
  • #5 17354526
    stasiekb100
    Level 31  
    Posts: 2031
    Help: 114
    Rate: 445
    Insert photos of the board, I will tell you where to put the resistor.
  • #6 17354724
    Krzysztof Reszka
    VIP Meritorious for electroda.pl  
    Posts: 10574
    Help: 609
    Rate: 1545
    metallhead wrote:
    I would not like to lose my guarantee

    Think carefully. Any interference is a loss of warranty.
  • #7 17360245
    metallhead
    Level 10  
    Posts: 7
    @ 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.
    MAGNUM MIG-MMA 220W IGBT Gas Flow Delay After Welding


    Added after 1 [minutes]:

    Krzysztof Reszka wrote:
    metallhead wrote:
    I would not like to lose my guarantee

    Think carefully. Any interference is a loss of warranty.
    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
    MAGNUM MIG-MMA 220W IGBT Gas Flow Delay After Welding

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

    if other photos are needed, it is enough to say.
  • #8 17361515
    stasiekb100
    Level 31  
    Posts: 2031
    Help: 114
    Rate: 445
    Good pictures, I know this board, but in it I changed the igbt switch-off current, the gas always worked properly.
  • ADVERTISEMENT
  • #9 17362535
    metallhead
    Level 10  
    Posts: 7
    @ 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.
  • #10 17362629
    stasiekb100
    Level 31  
    Posts: 2031
    Help: 114
    Rate: 445
    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.
  • #11 17366508
    metallhead
    Level 10  
    Posts: 7
    @ stasiekb100 and can you explain so more vividly in which place ??
    MAGNUM MIG-MMA 220W IGBT Gas Flow Delay After Welding MAGNUM MIG-MMA 220W IGBT Gas Flow Delay After Welding MAGNUM MIG-MMA 220W IGBT Gas Flow Delay After Welding MAGNUM MIG-MMA 220W IGBT Gas Flow Delay After Welding
  • ADVERTISEMENT
  • #12 17366835
    stasiekb100
    Level 31  
    Posts: 2031
    Help: 114
    Rate: 445
    MAGNUM MIG-MMA 220W IGBT Gas Flow Delay After Welding
  • #13 17835415
    patryk-84a
    Level 28  
    Posts: 1433
    Help: 40
    Rate: 211
    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.
  • #14 17835790
    metallhead
    Level 10  
    Posts: 7
    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.
Reply | New topic
Report a violation of the law

Topic summary

✨ The discussion revolves around the MAGNUM MIG-MMA 220W IGBT migomat, specifically addressing the issue of gas flow delay after welding. Users express frustration over the prolonged gas release after the welding button is released, which is seen as wasteful, especially during spot welding. Suggestions for resolving the issue include modifying the resistor in the RC circuit to adjust the solenoid's holding time, although this may void the warranty. Users discuss potential modifications, such as adding a 1k resistor between the source and gate of the gas MOSFET and altering the 358 amplifier settings. The conversation also includes requests for circuit board images to identify the correct components for modification. Overall, while some users are satisfied with the welder's performance, the gas delay remains a significant concern.
Generated by the language model.

FAQ

TL;DR: Want to fix long gas post‑flow on a MAGNUM MIG‑MMA 220W IGBT? "A 1k resistor between the source and the gate can be installed on the gas mosfet" — a simple 1 kΩ mod suggested here. [Elektroda, stasiekb100, post #17362629]

Why it matters: This helps owners reduce wasted shielding gas during spot/tack welding while understanding warranty implications.

Quick Facts

How do I shorten the gas shutoff delay on a MAGNUM MIG‑MMA 220W IGBT?

Use a simple hardware tweak. 1) Find the gas‑valve MOSFET on the control board. 2) Solder a 1 kΩ resistor between its source and gate to hasten turn‑off. 3) Test; if delay persists, tune the LM358 RC timing network. This targets the valve hold‑time circuit directly. Keep safety and warranty in mind when opening the unit. [Elektroda, stasiekb100, post #17362629]

Is there a front‑panel knob or menu to set post‑flow time on this unit?

No dedicated post‑flow adjustment is exposed on the front. The delay comes from an internal RC timing circuit. To change it, you must alter component values on the control board, which involves electronics work and risks warranty loss. [Elektroda, noopS, post #17351953]

What exact mod value and connection were suggested?

Install a 1 kΩ resistor between the source and gate of the MOSFET that drives the gas solenoid. This increases gate discharge and speeds valve closure after you release the trigger. [Elektroda, stasiekb100, post #17362629]

What if the 1 kΩ mod doesn’t reduce the delay enough?

Adjust the LM358‑based timing network that holds the solenoid open. Shorten the RC time constant around the LM358 controlling the valve signal. Make small changes and test, as layouts and values vary by board revision. [Elektroda, stasiekb100, post #17362629]

Which IC is involved in gas valve timing on this board?

An LM358 operational amplifier participates in the valve timing path. If a simple gate‑to‑source resistor does not suffice, modify the LM358’s RC network to shorten the hold time. [Elektroda, stasiekb100, post #17362629]

How long is the stock gas post‑flow on this machine?

The reported behavior is about 1–2 seconds of gas flow after releasing the trigger. For frequent tacks, that can feel like continuous flow between spots and waste gas. [Elektroda, metallhead, post #17348791]

Is this delay normal or a fault with my welder?

It appears normal for this board. An experienced user recognized the board and noted the gas function worked properly, suggesting it’s by design rather than a defect. [Elektroda, stasiekb100, post #17361515]

Where do I trace the gas valve driver on the PCB?

Follow the gas solenoid’s two red wires into the control board. They lead to the valve driver section and the MOSFET you’ll modify. Photograph both sides for clarity before changes. [Elektroda, metallhead, post #17360245]

Could opening the case and soldering void my warranty?

Yes. As one expert cautioned, “Any interference is a loss of warranty.” Plan mods only if you accept this risk or your warranty has expired. [Elektroda, Krzysztof Reszka, post #17354724]

Do I need to measure to find the precise RC parts on my unit?

Yes. Board revisions differ, so measure and trace to identify the exact resistor or capacitor controlling hold time on your board. “You have to measure.” [Elektroda, noopS, post #17352673]

How does this welder perform for home and hobby use overall?

The owner reports it works well and meets home project needs. The main annoyance is the extended gas post‑flow, which they had not yet modified. [Elektroda, metallhead, post #17835790]

Can someone guide me if I share board photos?

Yes. A knowledgeable user offered to indicate the resistor location from photos. Share sharp images of both sides for accurate guidance. [Elektroda, stasiekb100, post #17354526]
Generated by the language model.
ADVERTISEMENT