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Welding - Tacking of two pieces of steel together
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Posted By oneill
Hi All,
First off thanks to everyone who responed to my thread on noise, all info much appreciated. This time I'm wondering if anyone ever came across "Tacking"? It is when two pieces of steel are welded together, using Arc welding. We carry this out in our premised, however it is a two man job, one guy holds the piece together with a pliars and the other welds it. However the guy holding the piece will not wear a welding shield as it is cumbersome etc etc.. I am now looking into getting welding goggles or glasses that would at least lower the risk of Arc Eye, can anyone recommend a type of goggle or glass?
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Posted By Tony Bish
Why not replace the second guy with pliers that lock onto the metal sheets to hold them in place?
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Posted By Jane Blunt
I suggest you revisit the welding visor option. It is not just the eyes that need protection from the light from a welding arc. You can get very spectacular skin burns as well.
Why does the assistant not want to wear a visor when the welder him/herself does?
Tony B's idea is even better, as it reduces the numbers of people potentially exposed.
Jane
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Posted By oneill
The reason he won't wear the visor is due to the fact that he would not be able to see exactly where he is holding the piece in place. I agree with the first response totally and yours too.
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Posted By Anthony Slinger
If you are repetitively tacking similar components together, can you make a jig to hold the bits together? I would agree with reducing the number of persons exposed. The benefit is that they can be gainfully employed elsewhere!
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Posted By Jane Blunt
You can get visors that react to light so that you can see through them normally until the arc strikes up. Slightly more expensive, but you really should not be allowing this person to take an arc in the face.
He ought to be wearing gloves as well, and every part of his skin should be protected from the light.
If traditional welding visors are worn, which have a head band and a hinge, when two people work together on welding the person with the torch will generally give a verbal warning just he is about to strike up the arc. This enables both he and the co-worker to nod their heads and cause the visor to drop down over their faces at the right moment.
Jane
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Posted By oneill
Believe me he has been told, currently undergoing disciplinary procedure, I want to have the issue resolved as soon as is possilbe, all of your comments are gratefully received.
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Posted By Eric Taylor
Surely the guy is having a laugh at your expense? If the welder can see clearly enough to position his welding torch before he starts welding, then the assistant can see just as clearly. If it's a permanently obscure eyepiece in the mask, every welder I've ever seen has his mask up and nods to make it fall in to place. The assistant will be able to do the same. Alternatively, morem modern masks are clear until the arc starts then automatically go dark to protect your eyes. A bit dearer than permanently dark glass but still only about £70. How much time, expense, pain and paperwork will there be when he gets a bit of splatter on his face or the the outside of his tightly scrunched up eye lid!
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Posted By Robert K Lewis
Is it so difficult for him to use a handheld screen, these are also widely available. Of course if he is unable to keep his hand steady and the piece in place whilst using an appropriate screen then perhaps he needs alternative work.:-)
Bob
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Posted By Darren J Fraser
Purchase a welding magnet, these hold the metal in place - I know as using them to construct a kit car chassis and have not have a single failure of part movement yet.
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Posted By Chris Packham
Electric arc welding produces high levels of UVC. These are the most dangerous wavelengths, normally stopped by the ozone layer. They are the ones normally used to kill bacteria, i.e. cells!
This is one of the major reasons why oxyacetylene welding can be carried out using goggles whereas electric arc welding requires the full face shield and, as has been stated, full skin protection. Not do to this exposes the individual to a very high risk of skin cancer, not immediately but probably some years later. I would consider it imperative to use the appropriate PPE and to allow this not to be done could expose the company to considerable potential legal and compensation issues.
There are several methods for holding metal components together for tack welding. Clamps are probably the simplest and easiest to use.
Chris
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