OK This is my opinion on Chinese Inverter Welding Equipment.
First off I made a comment on another thread which someone has hit the “delete” key, must have been trying to find the “any” key! Thought there was such a thing as “freedom of speech” guess I was wrong.
Don’t really know yet whether this post/thread will be accidentally deleted !!
I have visited Manufacturers/ Importers premises over here and all there equipment is on pallet racking, they have already been tested from the factory with tested tags on them, there testing facilities are very sophisticated.
I have had many inverters in my shop, red, blue, yellow whatever.
Many of them have had blown IGBTs, Mosfets probably not matched or under rated
I believe that some manufacturers do not put high enough rated components in there equipment.
When I do a replacement of say a board under warranty it may say “revised version 5” with a list of what they have changed, mostly it is upgraded components, or a diode or two added. Now doing these mods to there PCBs is great, at least they are getting feedback from failed components and doing something about it!
Some engineer can design these bits and pieces and test them on a bench and loadbank in a controlled environment, temperature, dust, moisture, etc. But the proof comes when a person buys the machine and actually uses it under many different circumstances. One person may be an expert with the setup and use of the machine but may treat it like sh1t in the back of his truck, running them off a dodgy generator, allowing them to get wet, rain etc. Could go on but you get the drift about experts (Some)
Then you have the guy that treats his like a baby in his shed, but he really does not know about the welding side of things, gets his stick stuck to the job or the tungsten, mig wire, effectively shorting it out, yes there are some machines that have circuitry built in to help with these situations but it still happens.
I had a guy bring his Mig in with shot diodes, replaced them, he came back a month later claiming they were dodgy. I inspected the Mig gun and the tip holder and tip were blown away, he had shorted them to the job which in turn took out the diodes, assume that is what happened to the first lot. He learnt a costly lesson.
Then you have Mig’s, which some people when they have a problem with the feed they screw down the wire tension and yes it welds better, little do they realize that they are overloading the motor which can take out the control board
The operators that I am referring to should take more care with there equipment, and also READ the manual, yes I know that some manuals are very sketchy when it comes to information.
Inverters are great for there intended use which is to be light weight, less physical size, etc. But personally give me a good old bulky, large transformer, solid rectifier, simple circuitry, heavy duty components inside and out any day.
Who actually uses all the bells and whistles on a machine so equipped? Not many I would bet.
If a person can actually weld then he does not need all the extras!!!
I may have gone off the track a bit so to get back on track the problem with most Chinese welders are that the components are mostly of inferior quality, IGBTs and mosfets are not “matched” when installing them. When I replace these I make sure that they are matched and always replace the lot.
Where do you get parts or any technical information, or a simple circuit!!!!
The way that some are put together, my 10 year old could do a better job
I guess if you pay peanuts you get monkeys!!!!
Most Chinese welders do not appear to have any ongoing support, such as backup service, somewhere to take it for warranty issues, try ringing someone to answer a question etc
Whereas the better brands have service guys all over the place, can get parts easily, can ring any office and get answers to questions there and then. You can ring a Rep and he will come and visit you to discuss any issues that you may have.
I am saying that it is a lot of things that make a good product, reliability, function, versatility, service,etc
But the last thing should be price!!!
We have Chinese equipment over here that I sell and service as well as a lot of other people, but the difference is some of it has a 3 year warranty and there are local service agents to take them to, should they have a problem, they can ring the importer and get answers. They are very professional. I have confidence selling there product and they are Chinese made. Probably the difference is that the importers actually go to China and specify exactly what they want and it is overseen by an engineer not some person that has been promoted to “Quality Control Expert” and gets an extra 10 cents an hour.
If someone comes in to my shop and says “bought this on Ebay” I say sorry I cant help you. As it would probably cost more for me to fix it than to buy another one off Ebay.
So there is Chinese and there is Chinese
In short there are a lot of factors In the failure of some equipment!
Would I buy one for my own use? Not likely! Maybe if they got it all together?
I have a lot more input to this but I will wait and see what happens, probably a lot of flak, but eh I am thick skinned and can give it back!