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A Dead Welding Machine With Shorted Component Repaired. Model: Apex ARC-180

By on September 29, 2022
A Dead Welding Machine With Shorted Component Repaired. Model: Apex ARC-180

A welding technician brought this tiny welding machine for repair; he explained that it was taken to another repair tech, the machine got serviced but in two weeks time it was dead again.

welding machine repair

The moment I took the cover off I was able to see that the fan in this welding machine was replaced for some reason.

It was the right size fan so I moved on to the other side of the board and checked for faults.

how to fix welding machine

Here is the other side of the welding machine and I could see some work done on it. I did the de soldering of the IGBT’s but the components between these two is the area I am talking about.

fixing welding machine

The SMD components that is supposed to be 5.1R and 220 R were replaced with a tiny wires and I believe this was the reason this machine did not last long.

When checking with ohm setting on these two IGBT’s, there were supposed to be at least 27 ohm reading but now because of these wires, it was reading dead short even when the IGBT’s were de soldered off board.

test igbt in welding machine

When checking them with a multi meter, and as expected, the IGBT’s were shorted as seen in the photo. The part number is FGH60N60 and both had to be replaced on this welding machine.

bridge rectifier and igbt


Click Here To View FGH60N60 Datasheet

The bridge rectifier was not shorted but it had to come out to be checked any way and at the same time add thermal paste to the component then install it back in the machine.

how to repair and fix welding machine

The wires added to these components were removed and replaced with the right parts.

At this time I was ready to check the machine and to see if I have the right voltages at the positive and negative of the welding machine output.

how to test welding machine dc output

Yes, the voltages output as expected and the machine is ready to do some welding. 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.

P.S- Do you know of any your friends who would benefit from this content that you are reading now? If so, forward this website to your friends or you can invite your friends to subscribe to my newsletter for free in this Link.

Note: You can check his previous article on Welding Machine Powers On But Does Not Weld Repaired



  1. Albert van Bemmelen

    September 29, 2022 at 9:02 pm

    I hope that after this conclusion the customer still got his payment back from the previous engineer that made a useless repair. A wrong repair that obviously never could have lasted for long this way.

    • Waleed Rishmawi

      September 30, 2022 at 3:42 pm

      Albert: no he did not get his payment back but that tech lots a lot of business because of this bad repair. have a blessed day

  2. Parasuraman S

    September 29, 2022 at 10:22 pm

    One thing is for sure, if the welding machines in your area have any union, they may pass a resolution against you as they have to continue to work, come what may! They cannot take any long sick leave! (LOL)

    • Waleed Rishmawi

      September 30, 2022 at 3:43 pm

      Parasuraman: LOL, I guess that is true. have a blessed day

  3. Menahem Yachad

    September 30, 2022 at 1:07 am

    Well done Waleed.

    I am disgusted by the sloppy workmanship of the previous technician, who did the botched work, just to make a quick buck, and kick the customer out of his shop.

    As you well know, that type of sloppy workmanship is sadly very common in our area.

    You are a credit to our profession.

    • Waleed Rishmawi

      September 30, 2022 at 3:44 pm

      Menahem: yes, sad to say this happens a lot in our area but this tech lots alot of repair business because of this bad repair and it was worth it I guess. have a blessed day

  4. Yogesh Panchal

    October 1, 2022 at 3:47 pm

    Waleed, Good Fix!
    How can a man make jumper the resistor???, May be he has another though on another should personally meet the guy & thank him to provide you more Jobs....LOL

    • Waleed Rishmawi

      October 8, 2022 at 1:28 pm

      Yogesh: thanks man. totally agree; because of this mistakes I am gaining customers...good one. have a blessed day

  5. Lynn Blakely

    October 3, 2022 at 8:32 am

    Waleed: Thanks for the good article as always. Enjoy reading all the replies too.
    We see some humor also it is good to know it is always do a good job, to promote your business.

    • Waleed Rishmawi

      October 8, 2022 at 1:29 pm

      Lynn: you are most welcome. I am glad you are enjoying the article. have a blessed day

  6. Peter Sh

    October 4, 2022 at 2:17 am

    Thank you for another great article 🙂

    • Waleed Rishmawi

      October 8, 2022 at 1:30 pm

      Peter: you are most welcome. have a blessed day

  7. Luciano Khware

    November 25, 2022 at 3:20 pm

    Thanks for yet another great article Mr. Waleed. Keep it up!



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