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  1. #16
    Join Date
    Nov 2004
    Location
    Bungama SA
    Age
    52
    Posts
    960

    Default

    Quote Originally Posted by BobL View Post
    Zm melts at 690C, if there is oxygen around it starts to burn at around 790C and boils at 900C.
    Zn starts to get molten at 420°C, will start fuming/combusting in air at 600°c upwards. We vaporise it in a vacuum at 580~595°c and condense it into a crystallised form on a water cooled surface at work to recover it from lead(its added to remove Ag/Au).
    ....................................................................

  2. #17
    Join Date
    Dec 2018
    Location
    NSW
    Posts
    586

    Default

    Quote Originally Posted by Karl Robbers View Post
    Honestly I think it's a pretty weak argument in the grand scheme of things. Spray transfer is of limited use to most people as it is a downhand only process and most handymen do not have welders/power supplies capable of spray transfer with any sort of useful duty cycle.
    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.

    Quote Originally Posted by Karl Robbers View Post
    I would much prefer to use a gas shielded flux core wire if I had a heavy job to handle as I can run high amps flat, vertical and overhead with little or no change, whereas solid wire is limited.
    I agree.

    Quote Originally Posted by Karl Robbers View Post
    In my experience, most of the fumes come from the contaminants on the steel and I find CO2 welding no more or less fumey than Argon mix welding.
    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.

    Quote Originally Posted by Karl Robbers View Post
    I definitely agree though that welding fumes are often overlooked. There are so many options available now that were not about when I started my trade. You certainly don't need the full on Adflow hood as a hobbyist, but there are now several affordable respirators aimed at welders that will fit under a standard shield.
    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.

  3. #18
    Join Date
    Jan 2004
    Location
    Mackay North Qld
    Posts
    6,446

    Default 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

  4. #19
    Join Date
    Jun 2010
    Location
    Canberra
    Posts
    1,322

    Default

    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.

  5. #20
    Join Date
    Jan 2004
    Location
    Mackay North Qld
    Posts
    6,446

    Default

    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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