Tiggy_dorset
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What is the difference in weld strength between a gasless weld and a Argon/Co2 mix weld, in general?
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- Thread starter Tiggy_dorset
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asmeix6g
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depends what wire your using i guess! i cant remember the general codes for the wires we use but the esab codes are 15:14 and 15:17, the 15:14 is just crappy general work, comparable to a 6013 rod and the 15:17 is more like a lo hydrogen rod and i use that on all the pressure vessels....
from my understanding gasless has better penetrating properties over gas shielded solid wire... but dont quote me on that, im all bout the TIG n MMA!
from my understanding gasless has better penetrating properties over gas shielded solid wire... but dont quote me on that, im all bout the TIG n MMA!
If its a 70 grade (according to AWS)
The solid will be ER70S-6 and the gasless will be E70T-11 or -8 or something similar (there are a few according to welding position etc)
So theoretically they are the same. In practice the gasless will usually (not always) be slightly higher. Where they do differ is on ductility. The gasless can be quite brittle.
Some gasless have limited pass capability. The welds become brittle when a subsequent weld is placed on top, therefore, after 3 passes they have little or no notch ductility.
If I remember correctly the -11 is such as beast and you may see it limited to 10mm plate thickness which is actually wrong, its 3 passes, but this can equate to 10mm.
The solid will be ER70S-6 and the gasless will be E70T-11 or -8 or something similar (there are a few according to welding position etc)
So theoretically they are the same. In practice the gasless will usually (not always) be slightly higher. Where they do differ is on ductility. The gasless can be quite brittle.
Some gasless have limited pass capability. The welds become brittle when a subsequent weld is placed on top, therefore, after 3 passes they have little or no notch ductility.
If I remember correctly the -11 is such as beast and you may see it limited to 10mm plate thickness which is actually wrong, its 3 passes, but this can equate to 10mm.
Tiggy_dorset
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Thanks for the info guys. The reason I ask, is that I have been given a job to extract a couple of siezed diesel injectors from a cylinder head. I have the choice of using 0.8 solid wire or 0.9 gasless flux to weld a 22mm nut on the top of the injectors to allow us to free them.
I had the same job on another cylinder head a month ago where I used the 0.8 with success although the nut snapped off the first time, so had to reweld a new nut with a more solid weld to accomplish the task the second time round.
This time I am mobile and dont fancy transporting my gas bottle if I can help it, so was interested if gasless wire will be up to the job or not.
I appreciate the feedback so far.
I had the same job on another cylinder head a month ago where I used the 0.8 with success although the nut snapped off the first time, so had to reweld a new nut with a more solid weld to accomplish the task the second time round.
This time I am mobile and dont fancy transporting my gas bottle if I can help it, so was interested if gasless wire will be up to the job or not.
I appreciate the feedback so far.
At a practical level, gasless should give deeper penetration for the same current and voltage, because it runs hotter due to the flux.
But you do have to watch out for inclusions weakening the weld, just like stick welding.
Give the gasless a try, see how you get on.
If it's not putting enough down in two or three passes, consider using arc before going back to lugging gas bottles about?
But you do have to watch out for inclusions weakening the weld, just like stick welding.
Give the gasless a try, see how you get on.
If it's not putting enough down in two or three passes, consider using arc before going back to lugging gas bottles about?
Tiggy_dorset
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I decided to go for the shielded solid wire option as it is already a tried and tested method, plus as advised in a post above, I didnt know if I would have to make several passes and didnt want to chance weakening the weld with multiple gasless passes.
I have to say I was reasonably impressed, with the nut welded only half way round (due to lack of access) with my little Sealy 150, it held on tight despite the need for a leverage of about 1.5m long to get the injector to even think about budging. persistance and a lot of grunt back and forth, we got the ****** moving.
Got paid £30 for an hours work and the promise of spreading the word of my various services. She was happy and I was happy.
I have to say I was reasonably impressed, with the nut welded only half way round (due to lack of access) with my little Sealy 150, it held on tight despite the need for a leverage of about 1.5m long to get the injector to even think about budging. persistance and a lot of grunt back and forth, we got the ****** moving.
Got paid £30 for an hours work and the promise of spreading the word of my various services. She was happy and I was happy.
