This welding machine was brought to me about one month ago. It had intermittent problem with it when it comes to welding. The first time was brought to my shop, it had a lot of cold soldering joints and I re soldered every joint in this machine. To my surprise, this same machine came back to me after one month again with the same exact problem.

I think it is a Turkish made machine. This guy sells used and brand new machines.

In my country, our main product either made in china or turkey and if you afford to pay more money, you would get better products that will last longer and give you better quality results.

 Since the main problem was sometimes it welds fine and sometime while the machine is on it does not weld, the only way to find out the problem is by doing a lot of welding and hopefully I will find what is wrong with it.

The first two minutes it was welding fine but I noticed after five minutes as I heard a noise coming out of the machine and I could not weld no more. If you look at the photo, the red light came on. It is an overheating issue if this LED light comes on while welding. My chain of thoughts was focused on the noise that came out of the machine. It sounded like a discharge noise. I decided to take it apart.

As I was taking it apart, look what found. In this situation, the burnt smell led me to this finding. I considered myself lucky to find it that soon before dismantling this machine.

This is the other side of the plug that feeds the two transformers bellow the Mosfet heat sink.

It is a pain to get to these transformers out as you can see in the photo.

I got rid of the plastic plug because it was already burning and then cleaned the contacts, cut the main wires off soldering them to the cleaned pins and add silicon to them.

These are the pins on the main board.

Silicon added to the pins soldered to the main board was a precaution step to avoid pins touching and causing damage to the machine.

I took the machine to my brother who is a welder, test it for almost the whole day and it did not cause any welding issues. I was happy with the results and I am sure the customer was too.

Mission Accomplished.

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 repair articles in the link below:

https://www.electronicsrepairfaq.com/heres-a-quick-way-to-repair-cash-register