No it doesnt - read the COSHA report.
[No it doesnt - read the COSHA report.[/quote]
I stand corrected.......
I have just read this,
ingredients in throat lozengers that are recognized as significantly effective in reducing the duration and intensity of the
I stand corrected.......
I have just read this,
Welding of Galvanized Products
Welding of galvanized steel is done almost exactly the same way as welding of the bare steel of the same composition; the
same welding processes, volts, amps, travel speed, etc. can be used with little modification when the switch is made from
uncoated steel to galvanized steel -- unless the zinc coating is unusually thick.
The difference between welding galvanized steel and welding uncoated steel is a result of the low vaporization temperature of
the zinc coating. Zinc melts at about 900°F and vaporizes at about 1650°F. Since steel melts at approximately 2,750°F and
the welding arc temperature is 15,000 to 20,000°F, the zinc that is near the weld does not stand a chance -- it's vaporized!
By the time the weld pool freezes, the zinc is gone. This has two immediate consequences:
• The vaporized zinc increases the volume of welding smoke and fumes.
• The zinc at and near any welds is actually burned off by the heat of the arc, removing the protective zinc coating.
same welding processes, volts, amps, travel speed, etc. can be used with little modification when the switch is made from
uncoated steel to galvanized steel -- unless the zinc coating is unusually thick.
The difference between welding galvanized steel and welding uncoated steel is a result of the low vaporization temperature of
the zinc coating. Zinc melts at about 900°F and vaporizes at about 1650°F. Since steel melts at approximately 2,750°F and
the welding arc temperature is 15,000 to 20,000°F, the zinc that is near the weld does not stand a chance -- it's vaporized!
By the time the weld pool freezes, the zinc is gone. This has two immediate consequences:
• The vaporized zinc increases the volume of welding smoke and fumes.
• The zinc at and near any welds is actually burned off by the heat of the arc, removing the protective zinc coating.
Zinc Fumes -- A Safety Hazard?
When zinc vapor mixes with the oxygen in the air, it reacts instantly to become zinc oxide. This is the same white powder
that you see on some noses at the beach and the slopes. Zinc oxide is non-toxic and non carcinogenic. Extensive research
that you see on some noses at the beach and the slopes. Zinc oxide is non-toxic and non carcinogenic. Extensive research
1
into the effects of zinc oxide fumes has been done, and although breathing those fumes will cause welders to think that they
have the flu in a bad way, there are no long-term health effects. Zinc oxide that is inhaled is simply absorbed and eliminated
by the body without complications or chronic effects. Current research
have the flu in a bad way, there are no long-term health effects. Zinc oxide that is inhaled is simply absorbed and eliminated
by the body without complications or chronic effects. Current research
2 on zinc oxide fumes is concentrated in establishing
the mechanism by which zinc oxide causes "metal fume fever," how its effects are self-limiting and why zinc oxide fume
effects ameliorate after the first day of exposure even though the welder may continue to be exposed to zinc during subsequent
days ("Monday-morning fever"). Other research3 is being done using zinc oxide fumes together with various drugs which
results in a synergetic effect for treatment of cancer and AIDS. Another area of research is use of zinc compounds as the active
the mechanism by which zinc oxide causes "metal fume fever," how its effects are self-limiting and why zinc oxide fume
effects ameliorate after the first day of exposure even though the welder may continue to be exposed to zinc during subsequent
days ("Monday-morning fever"). Other research3 is being done using zinc oxide fumes together with various drugs which
results in a synergetic effect for treatment of cancer and AIDS. Another area of research is use of zinc compounds as the active
ingredients in throat lozengers that are recognized as significantly effective in reducing the duration and intensity of the
300tdi
New Member
As said earlier, no worries, grind (or burn off with oxy acetylene) the galv coating. If you leave any of the coating there it will pop and fart all over the place when you wled and it will significantly reduce the stregth of your welds.
I remember months of doing this on a recall of ALL mkI Renault Espaces, the chassis legs had insufficient weld on them and were dangerous in a front end impact. I spent months scraping the galv off and welding up many an Espace. Hateful things they are!
I remember months of doing this on a recall of ALL mkI Renault Espaces, the chassis legs had insufficient weld on them and were dangerous in a front end impact. I spent months scraping the galv off and welding up many an Espace. Hateful things they are!
