clarification of welding operation

[gil]

Hi.
want to ask you some clarification on the operation of a mig/mag welding machine (gmaw). it is correct to say that:

the torch is connected to the positive pole, and the clamp to the negative one. By connecting the clamp to the iron to be soldered and leaning the torch closes the circuid generating heat near the torch.

if it is so touching clamp and torch why do not remain lightning? depends on the low voltage?

p.
I put the post here because I didn't know where to put it.

 

[MBT]

Meanwhile in the gmaw welding, unlike the smaw, the torch has a "grilletto" to give tension, to advance the wire and to flow the gas.
However, in the smaw welding (the coated electrode) the vacuum voltage is about 80-100 v which drops to 25-30 v when the arc is triggered

attention, that the minimum voltage threshold considered dangerous is 50V alternating current and 120V in continuous current

then touching the torch of a welder is not properly "safe"!

 

[gil]

So the statement is correct?

 

[MBT]

partially, in my opinion
the vacuum tension of the welding machine is low, but beyond the limit of the safety threshold!
I do not know the vacuum voltage of the gmaw welding machines

 

[Er Presidente]

the "saldatrice" generates a positive pole and a negative "unreported".
What does that mean?
when you look at the enel's tralicci you will see three (large but always three) pipelines are the three "phases" of the alternating current.
One is missing from the "neutro", in the house we have only one phase plus the neutral that "turn".
in total should exist five "cavi", the three phases the neutral and the "land".
the land, the "ground", soon ends, just outside the building, in the "pozzetto" of land.
The "neutro" just a little further in there, to save a few billion miles of "filo" the "neutro" ends up in "cabina", and where does it end? Down.
practically the neutral and the earth are the same thing (you can also try it and you will see that the earth and the neutral of the sockets there is a "right" so we, our body, for any "phase" we are "the other half of the world", the neutral.
as soon as we come into contact with a phase the electrons return to "central" using the ground but passing through us instead of through the cabin.
If, instead, a "unreported" current is produced, that is, with a transformer gi generates a new phase with a new "neutro" and does not put it "on the ground", this phase does not "see" the central enel, seeks the "your" neutral to return to the transformer.
It's a widespread security system, and the "saldator" uses that system.
However, a minimal loss of system insulation can suddenly "refer" the neutral to the ground and put us in trouble. needs a life saver in good condition, always.
The eye that the "mass" of the welder, the one that attacks the piece, is his "half", so we avoid touching it at the same time as the "torcy".

the current "continue" (direct, button or not) not "folgora", the lightning that makes "alternate" dangerous is caused by the 50 hz to which the heart is forced to pulsate. But it's even more dangerous, because it's "silent."
the current continues "magnetizes" blood and iron atom of hemoglobin, so the damage is very serious and, at the moment, not perceptible. That's why you chose the alternation.
who works with the dc (direct current) must be alert even more and never underestimate strange "debolezze" and sudden malori.

 

[MBT]

excellent dexamine
is well explained also on wikipedia what the dc entails regarding the achttp://it.wikipedia.org/wiki/elettrocuzionefor welding machines, try to consult the site of a well-known welding machine manufacturerhttp://telwin.com/webtelwin/site.nsfand you will find many interesting data. . .

 

[gil]

Thank you, Mr President, for your resignation.
remaining on the topic how would you explain in a few words the operation of a wire/electrode welding machine? is this explanation acceptable or does it contain errors?

the torch is connected to the positive pole, and the clamp to the negative one. By connecting the clamp to the iron to be soldered and leaning the torch closes the circuid generating heat near the torch.

if it contains errors or inaccurates as you would change it?

 

[Er Presidente]

Thank you, Mr President, for your resignation.
remaining on the topic how would you explain in a few words the operation of a wire/electrode welding machine? is this explanation acceptable or does it contain errors?



if it contains errors or inaccurates as you would change it?

an electric arc that produces heat (although the chemicalphysical process of welding is much more complex at atomic level).

Hi.

 

[gil]

Thank you for your clarifications and suggestions.