Hi every one Im new to this forum and have some problems with my tig welder if any body has to answers it would be great. Here's my issue my welds have started to have what seams to be contamination when I tack the part together after I lift the torch the weld pools up with a high spot and I just thought it was the steel I was welding but it keeps happing it has never done this before and its not consistent I can weld one part and have no issues and weld the exact same part and have problems and its even on new machined peices so I know it shouldnt be the steel but I can figure it out I have been using new tig rod but have switched back to the stuff I was using before and still have issues. I also have a few times where Im tacking a part and its kind of like I hit a air pocket and it blows a low spot in the part but I can tack the other side and it wont do it. Here is a picture of a weld I had break on a post hole driver for my dad its a this plate but as you can see it has penetration but the weld broke So Im kind of lost if any body has any ideas please let me know. Thanks
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Tig welder problems
- Thread starter 3kross
- Start date
A bigger pic with better lighting would help. Looks like some porosity going on at least, maybe some lack of fusion (LOF) too? Off the top of my head some causes of porosity...
A shielding gas problem can cause that- leaks drawing in air, a small hole in the torch line would fit with the randomness of it as flexing the hose opens and closes the hole
Asking for TIG filler wire at the shop and being sold oxy fuel filler which doesn't contain deoxidisers and rarely works properly under the (inert) pure argon used with TIG
Welding rusty/manky material OR (as you mentioned new machined stuff) welding free machining steel- contains lead/stuff that makes it easier to machine but screws up weldability
Doesn't fit so well with tacking things but if there's no vent i.e. welding something to tube that effectively caps the ends then the air inside gets hot, expands and blows the weld pool out if it's not given an easier escape route. Normally encountered when finishing the weld/closing the tube
Incorrect torch angles and arc length messing with gas shield, especially if flow rates are out- excessive or, more rarely, not enough
The rust visible in the pics suggests cleanliness/weld prep is part of it/the leading candidate for that piece at least
A shielding gas problem can cause that- leaks drawing in air, a small hole in the torch line would fit with the randomness of it as flexing the hose opens and closes the hole
Asking for TIG filler wire at the shop and being sold oxy fuel filler which doesn't contain deoxidisers and rarely works properly under the (inert) pure argon used with TIG
Welding rusty/manky material OR (as you mentioned new machined stuff) welding free machining steel- contains lead/stuff that makes it easier to machine but screws up weldability
Doesn't fit so well with tacking things but if there's no vent i.e. welding something to tube that effectively caps the ends then the air inside gets hot, expands and blows the weld pool out if it's not given an easier escape route. Normally encountered when finishing the weld/closing the tube
Incorrect torch angles and arc length messing with gas shield, especially if flow rates are out- excessive or, more rarely, not enough
The rust visible in the pics suggests cleanliness/weld prep is part of it/the leading candidate for that piece at least
Thanks Hotrodder here's another thing I come up with last night let me see what you think I read some where last night about moisture in steel so I went out and held that same peice under my torch and you wouldnt belive the moisture that came out am I right in thinking that moisture is just as bad as dirt or rust on the meterial being welded I also went to one of my other lazer cut parts and had the same thing not as bad but it was still there. any suggestions on keeping moisture out.
Steel doesn't soak up water like a sponge, the moisture is coming from the flame... water is a byproduct of combustion which condenses on the relatively cold metal. As the metal warms up the water vapour stops condensing on it so it appears that the moisture has been 'sweated out' and an old wives tale is born
With the exception of water jet profile cutting leaves a HAZ (heat affected zone) and depending on the process/gases used the cut edges can have oxides/nitrides on them
With the exception of water jet profile cutting leaves a HAZ (heat affected zone) and depending on the process/gases used the cut edges can have oxides/nitrides on them
Hey Hotrodder I didnt think there could be any way the steel had moisture but it sure looks like it, I just fiished up my steel tumbler tonight and Im going to try and tumble some parts and see how they weld with a nice clean surface maybe that will take care of my problems Il keep you posted. Thanks for the help.
hi hotrodder, i have blow back at the end of my tig weld and would fit what you said about trapped air/gas. i'm filling in a fillet that has a jacket behind that fills with water to cool product, i,ve drained the water but still i get blow back on closing the weld. what should i do to stop blow hole.
