Welding Machine Powers On But Does Not Weld Repaired. Model: Straus
A welding technician brought this welding machine for repair and the complaint was it comes one, the fan is running but it does not weld at all.
That is a bigger size welding machine and sad to say they do not make like these ones any more. Now there are all smaller in the size, cheaper and breaks fast. I powered on the machine and sure enough like what the customer said, I could hear the loud fan running but the relays did not click. The relays has to click otherwise the machine will not weld.
Two things I have in mind right now, either the relays are bad, or the relays are not getting the 24 volts to operate, let us find out what is causing this issue.
The first thing I checking for voltages on the three relays in this machine and guess what? They were not getting any power there which an indicator the line is bad or the main brain that sends out the 24 is not doing its job.
Look what I found, someone has been in this machine and replaced an SMD resistor that is supposed to be 1.5 with 1 ohm resistor.
The replacement is fine but why did the resistor was replaced? It is very clear that after the resistor was replaced the machine is still did not weld indicating there are more faults in it.
Just below that line of that replaced resistor I found a 220 SMD resistor that was open.
I soldered a new resistor there and checked for more faults in that machine but found none.
I found an IC that looked damaged but when took it off board cleaned but it seemed fine so I put it back on board.
I tested the machine through a current limiter and guess what? It came on but the fan in the middle of this welding machine did not sound good at all and needs some attention.
The customer did not want replace it as long it is running because he does not mind the loud sound coming out of it. So I sprayed some fan lubrication and sounded much better but replacement was recommended.
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 Dental Device With Bad 9 Pins USB Port Ripped Off Board Repaired