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Topic Review (Newest First)
02-11-2007 08:41 AM
oldred Adtkart, You bet that makes a difference! I blow out my welders regularly and even if it has only been a day or so there usually is quite a bit of junk comes out of there. I had a fellow bring his little Hobart over because it would overheat almost as soon as he started welding and when blowing it out did not help we opened the case, it had a large mouse nest almost completely surrounding the transformer! We removed that mess and the problem disappeared
02-11-2007 07:42 AM
adtkart To expand on what Red said, it's a good idea to blow the machine out every once in a while also. I don't know of many garages that don't have dust, and it likes to collect in any type of machinery, specially stuff that operates on electricity. If there is a fan in there, it will suck up more dust than a shop vac.

Aaron
02-10-2007 08:07 PM
oldred Thats what happens when the duty cycle is exceeded or some machines just shut off, an extension cord can make this problem even worse. Make sure the wiring is up to par and if an extension cord is used it must be sufficient in size to carry the current. If the wiring is in order I have seen the problem helped, but not eliminated by adding a fan to the welder case to help cool the transformer, a fan is not always used from the factory on some cheaper outfits and these always benefit from the addition of one. Even welders that are already cooled can usually benefit from the addition of a larger fan. This may not be a practical thing to do in every case but it is something to be considered.
02-10-2007 07:31 PM
captmetal i have a 110v lincoln a great welder but if i used it a lot it does the same thing , i learned that the transformer inside are just getting overheated and it seems to reduce the power, it takes a long time for it cool off, usally i wait till the next day to finish, or if i can i take breaks before it heats up.
12-17-2006 10:12 AM
oldred I too have used sandblasting to prep weld areas for years and welding body sheetmetal that has been blasted is about as common as anything can be. There is a theory (or rumor) that the silica embedded in the metal can cause a loss of strength on body panels because the amount of silica will be high in proportion to the size of the weld puddle. Personally I think this is a bunch of bull and is of no real concern but since it is so easy to remove it may be a good idea to do so, as far as being able to tell a difference in the welding characteristics I can't see much if any difference.
12-16-2006 11:33 PM
Ripped I am doing my best imitation of Homer Simpson,
Doh ( :o (|)

it was the contact tip
12-16-2006 08:56 PM
Ranchero_65
Quote:
Originally Posted by MARTINSR
Sandblasted metal not easy to weld? That blows me away, I have never noticed!

Have you changed the tip? If you tip gets worn out (its hole gets larger where the wire comes out) it can't transfer the amperage to the wire.

Brian
Brian , I have not had a problem ether welding metal I just sandblasted. I have a cheapy Century 100 and I use the JW Harris Twenty guage wire with gas.

Ripped What kind of wire are you using ? I read throught this thread and don't see this mentioned . Hope you get it sorted out .

Take Care
Earl
12-16-2006 05:39 PM
MARTINSR Sandblasted metal not easy to weld? That blows me away, I have never noticed!

Have you changed the tip? If you tip gets worn out (its hole gets larger where the wire comes out) it can't transfer the amperage to the wire.

Brian
12-16-2006 04:15 PM
Ripped Thanks for all the advice. I have read through the posts. I tried to make certain my ground was better, prepped the welds a little differently. Tried a couple welds, then promptly ran out of wire. Tried again the next day, and ran out of gas!
So I had the tank filled today. I asked the tool place (where I bought the welder) about a trade up to a new welder. It's funny how the story changes, from when I bought the used welder off of them, how it was no problem to trade in/upgrade. Today it's a little different story, surprise -surprise Anyway, got a recharge, and I bought some new contact tips.

I told him that I'd come back and check out the new welder at another time (NOT)

So I'll try again, tonight, after xmas shopping.
12-15-2006 04:30 PM
oldred Silica embedded in the metal surface. It does not seem to be much of a problem on thick stock but on something as thin as body panels it probably is not a good idea, however it is easy to remove so if you clean it good before welding it should not be a problem.
12-15-2006 01:36 PM
Jake_Dragon
Quote:
Originally Posted by weirdbeard
NO. jk. I looked but could not find where I read that. Dangit! It had something to do with certain types of blasting media impregnating in mild steel and causing weld failure.... I think.. I googled and only found lot of people USING sandblasting to clean metal to be welded. Just ignore me. I am confused.
The sand will contaminate the steel and make it hard to weld. You need to grind the metal till its shiny.
12-15-2006 12:23 PM
weirdbeard
Quote:
Originally Posted by STATUTORY GRAPE
Why Care to elaborate
NO. jk. I looked but could not find where I read that. Dangit! It had something to do with certain types of blasting media impregnating in mild steel and causing weld failure.... I think.. I googled and only found lot of people USING sandblasting to clean metal to be welded. Just ignore me. I am confused.
12-15-2006 05:10 AM
STATUTORY GRAPE
Quote:
Originally Posted by weirdbeard
All my books say sandblasted metal does not weld very well at all. When welding sandblasted metal you have to grind smooth the textured area to be welded.

Why Care to elaborate
12-14-2006 05:19 PM
weirdbeard
Quote:
Originally Posted by Ripped

The welder seems to be having less and less power. I have learned to keep my weld area clean, to the extent, that I even sandblast difficult areas between welds.
All my books say sandblasted metal does not weld very well at all. When welding sandblasted metal you have to grind smooth the textured area to be welded.
12-14-2006 05:13 PM
STATUTORY GRAPE Not sure if this is the problem your having,,,BUT,,, on my welder one time the roll of wire got a light coating of rust on it from moisture and from not being used in a while so the wire wouldn't slide through the cable to the handle (it would stick) so sometimes it would weld and other times it just hissed. Also, if the cable that the wire slides through gets kinked the wire won't slide either. I ended up taking the handle apart and cleaning the cable and I found a kink that I straightened and it works like new again
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