Instructables

Refreshing your Lincoln AC-225 220V tombstone welder

Picture of Refreshing your Lincoln AC-225 220V tombstone welder
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Good day,

I recently purchased a Lincoln AC-225 welder for $40 (Minus leads of course). Before I plugged it in I decided to take it apart and clean it. I will show you how you can take your old welder and make it work like a new one.

These machines have been produced for many years, and chances are you own one, why not pass it on to your kids? 

I cannot state how easy this is to accomplish. Chances are if you own one of these welders you are more than proficient to dissemble its simple switch assembly and properly clean and lubricate it. In fact, the most difficult part in my opinion, is the tedium of removing the screws to access the internals. 

Please, do not be afraid to attempt this. 

You will need:

Tools to remove sheet metal screws, plus a phillips, and flat screwdrivers
5/16", 3/8", an 7/16" box end wrenches and sockets (One of each for each size)
Good quality grease. I used Mobile-1 Synthetic automotive grease
A Dremel tool with light abrasive polishing bit 
 
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Step 1: Cut the breaker, unplug the welder, then start removing screws.

Picture of Cut the breaker, unplug the welder, then start removing screws.
Unplug your welder. This is a life and death step. 220VAC is very dangerous-it is dangerous because it is high current, and it GRABS you when you come into contact with it. Higher voltages such as 30kV low current are actually less dangerous, because they will REPEL you. 

So make sure your tombstone welder is unplugged, because it's too early to have your own. Tombstone, that is. 

There are lots of screws. Mine had an amalgamation of flathead, phillips, and hex-head screws. I am not sure if they come from the factory like this. 

I did not take pictures of every step as far as screw removal goes. All I can tell you is to keep all of the screws in a container. 

The front specification plate must be removed. To do this, there are 4 screws in the front, but you must also remove the selection switch handle (White arrow). To do this, simply remove the flathead screw that is in the fat portion of it. (See green arrow)
Geordi2 months ago

I would like to give my thanks too. I was given a fairly old welder and wanted to put it to use. Its a bit different than yours (small flat steel connectors to the selector instead of wires) but enough to help me on the way.

Thanks again

tundrawolf (author)  Geordi2 months ago

You are welcome! It makes me glad to know that people are helped by this. Remember to polish those flat connectors where they are screwed down, both sides, for optimal conductivity.

whiterider1 year ago
Thank you so much for posting this. I acquired a welder that has not been used for years and has been stored in a place that was not the most waterproof. Your instructions just may get me up and running!
Bobdeham1 year ago
It a transformer based machine and as long as it unplugged from line AC mains there is no shock hazard.
Even though it is unplugged is there still a chance it could shock me? Anything inside that I could get shocked with?
stantique2 years ago
I just bought one of these with the leads for $100. This instructional works! I revamped mine with following this page and no cash. It now runs like brand new! Thanks alot!
tundrawolf (author)  stantique2 years ago
Thank you very much. It makes my day to see you helped. Thanks again.
ungubungu2 years ago
An excellent article on the tune up for Lincoln welders. Great pics and great script. I used dielectric grease meant for spark plug boots. Also it helps to pull out on the selector switch when making voltage changes.
tundrawolf (author)  ungubungu2 years ago
Thank you for the kind words.
bilray3 years ago
Very useful info and good job, Thanks.
tundrawolf (author)  bilray3 years ago
My pleasure. Happy to be a help.
My welder was stuck on the 75 amp setting, thanks to your instuctable I took it apart and refreshed every contact in it.Works like new.Thanks again.
tundrawolf (author)  bilray3 years ago
I was very blessed by this comment. Thank you.
rimar20003 years ago
You did a very good deal!
tundrawolf (author)  rimar20003 years ago
Thank you my friend! Muchos gracias mi Amigo!