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Thread: Welding galv/ zinc plate steel
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12th Mar 2020, 01:18 AM #16....................................................................
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12th Mar 2020, 06:55 AM #17
I did preface this all with 'if it's part of the concern'. Spray transfer has it's applications, maybe not this one. TBH, the specs of a machine the user has is not my concern- the science is there that true spray transfer is not achieved at CO2 concentrations over ~25%. This is probably one of the authorities on the matter, and probably one of the more credible sources - https://app.aws.org/forum/topic_show.pl?tid=1998 AWS- they pretty much make the specs on welding consumables.
I agree.
I can't agree to this. I saw a back to back test on a robotic welder where the same welding parameters were tested back to back with an Ar mix and CO2. huge difference. Fume comes from the steel itself, the wire, and it is all stirred up by the arc energy of the welding arc. CO2 has a higher arc energy (hence the penetration profile), and as such generates more fume. Some of the lower arc energy processes in the primo machines will effectively reduce fume, but gal is a whole different beast, so in that case fume is generated irrespective of shielding gas.
This is one of those 'the more you know' topics. Seen plenty of fellas busting their guts on a gal job in a production environment all week, even to the point where one place had 10% of their staff off work each day 'sick' (pro tip- it wasn't a big night before- it was fume).
The big change here is that the excuse of an employer that "it won't hurt you, harden up" won't work anymore. It is now classed as a carcinogen. So employer duty of care etc comes into it, and some protection methods need to be there. The easiest is a P2 mask. Some of the better stuff out there is the fume extraction torches with an adflo helmet. As of 2018 there was court cases for welders seeking compensation for chronic lung cancer as a result of welding high chromium stainless for his whole life, without any other risk factors. Feel sorry for the bugger. Warnings have been on wire and rod boxes for a very long time.
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12th Mar 2020, 01:56 PM #18
OFF Topic Posts
Ladies and Gentlemen,
There have been reported posts and complaints about this topic of posters who are not following normal convention regarding keeping on topic.It is a common sense and courtesy convention operating on most forums.
Specifically the OP spoke of tig braze welding of zinc plate.
From there it morphed out in all directions.
We all want to add to metal work information and not suppress it so here is what I shall do.
The reported post wanted me to strip out the non topic post and move them else where.
Sorry! No can do as it would have me creating many new titles and moving the bunch of OFF topic posts (all slightly different to one another) to separate posts.I don't have that time available to me.
If you want your (off topic) post to survive please cut and paste it to a new new topic (created by you) into the welding area.
It is all great info and prompt action will insure it can be searched for and found in the future by those who may need it.
After a week or so, I will go through the original post and cull out the off topic stuff. If you don't care one way or the other, that info will be lost.
Grahame
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12th Mar 2020, 02:44 PM #19Diamond Member
- Join Date
- Jun 2010
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- Canberra
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I would suggest that if a poster is particularly sensitive about thread purity, they put a little more thought into the title of their post, as pretty much all of the responses touch on welding glav / zinc plated steel.
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12th Mar 2020, 11:25 PM #20
Hi Rusty Arc,
There is that, but I can't say it, can I ?
It's not much fun trying to do an Abraham Lincoln and please all of the people, all of time, I can tell you.
People do hijack threads inadvertently and I have been guilty of that too.
If you have a salient point and its off topic a bit, its not real hard to write a new post.
It makes searching for that information a lot easier, five years down the track.
Grahame
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