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How To Fix A Hugong Welding Machine That Powers On But Does Not Weld

By on July 1, 2023
How To Fix A Hugong Welding Machine That Powers On But Does Not Weld







A welding technician brought this machine for repair. The customer explained that it welds badly and it goes into shut down tripping the earth leakage circuit.

how to repair welding machine hugong

That is one of the best welding machines I have encountered in the shop.

They are small and compact but the welding on it is just amazing.

welding machine pcb board repair

It has two boards connected to each other through two sockets on both side of the board. There are a few screws holding the two boards together, remove the screws and the two boards will be free for check up.

welding machine pcb board fix

That is the top view of this welding machine; the screws were out as seen in the photo.

how to fix hugong welding machine

That is one board and you can see the black socket to the left side of the photo.

So basically it is very easy to work on and take apart when needed.

bad components in welding machine

That is the second board on this welding machine that has all the IGBT on. So as the customer said that it welds badly and it trips the earth leakage circuit? So I checked the IGBT for bad soldering joints / shorts but there were none.

burnt capacitor

If you look to this capacitor, you would see electrical sparks on the one of the pins and if you look also on the board where this capacitor was soldered on you would see that one hole is full solder and other one is not which indicates that one of the pins of the capacitor was broken off the board and that explains the electrical sparks show on this capacitor.

badly burnt capacitor

The damage is very clear on this side of the board so I cleaned the area and added another capacitor with longer pins to be soldered here.

fixing pcb board

I have plenty of these capacitors sitting in my shop and so I did the replacement, put the machine back together and tested.

series light bulb trick

That is the current limiter on when I powered on the machine and that is normal since there are heavy duty capacitors and a big fan running at the same time.

As always, I took it next door to my brother’s welding shop for testing and the machine was up and running according to specs; this time it was not tripping the Earth leakage in the shop.

Mission Accomplished.

waleed Rishmawi

This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.

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Note: You can check his previous article on A Head LED Light That Was Flickering Repaired And Maintained




  1. Parasuraman S

    July 1, 2023 at 10:46 am

    Very good fix! Thanks for sharing, dear friend!

    • Waleed Rishmawi

      July 1, 2023 at 2:00 pm

      Parasuraman: thanks man. you are most welcome. have a blessed day

  2. Tayo

    July 1, 2023 at 11:00 am

    Well done Waleed.
    Eid Mubarak.

    • Waleed Rishmawi

      July 1, 2023 at 2:01 pm

      Tayo: thanks man. I appreciate your comment about Eid but I am Christian I do not celebrate Eid. have a blessed day.

    • Imoudu.O

      July 2, 2023 at 2:21 am

      Experience is the best teacher,so your experience come to play.Well done friend.

      • Waleed Rishmawi

        July 3, 2023 at 3:39 pm

        Imoudu. indeed. have a blessed day

  3. Albert van Bemmelen

    July 1, 2023 at 2:29 pm

    Regardless of how much dirt these welding machines collect you always are able to fix these machines trustworthy and with confident!

  4. Waleed Rishmawi

    July 3, 2023 at 3:44 pm

    Albert: thank you for the nice comments. I appreicate that very much. have a blessed day

  5. Yogesh Panchal

    July 5, 2023 at 11:11 pm

    Thanks! For sharing Waleed ,


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