Re: Why does Oxy Acet crack sometimes?

That happens with the tip gets too hot. If the tip is black with carbon soot, polish the end. If the tip is to small for the job so you're too close to the work, that will also overheat the tip. Either way, the hot tip causes the oxy/fuel mix to explode inside the tip.

Do you have flashback arrestors at your torch? You should. Are you adjusting for a neutral flame? That is a flame where you add just enough oxygen to close the outer blue cone onto the center one. More oxygen than that runs the tip hot and the extra oxygen consumes your work. (steel burns in the presence of oxygen) If you have a carburizing flame, with a second blue cone, you have excess fuel. The carbon in the fuel will add carbon to the steel, making your welds very brittle.

Deb wrote:
Done a little MIG welding, and Arc, but never Oxy Acetylene. Had a go with some gear my friend has, and found that I often get a laud CRACK and this occasionally blows out the flame, its very similar to a small explosion.

why is this?

Is it because I am holding the flame too close to the weld?

Or is it to do with the mix of the gasses?

Any help offered most welcome.

Thanks all Deb
.

Relevant Pages

  • Re: Hondas FCX hydrogen car
    ... I see you kept calling people idiot at the times. ... Natural Gas produces so little carbon comparing to carbon from Gasoline ... If you examine a flame, ... flame will radiate at the color temperature that they are raised to by ...
    (sci.energy.hydrogen)
  • Re: Hondas FCX hydrogen car
    ... Where does the carbon go? ... Can Somebody teach the idiot how to distinguish between toxic and non-toxic Gas through the color of the flame itself? ... elements within the flame will radiate at the color temperature that they are raised to by the flame. ...
    (sci.energy.hydrogen)
  • Re: Hondas FCX hydrogen car
    ... Natural Gas produces so little carbon comparing to carbon from Gasoline ... If you examine a flame, ... flame will radiate at the color temperature that they are raised to by ...
    (sci.energy.hydrogen)
  • Re: Hondas FCX hydrogen car
    ... Natural Gas produces so little carbon comparing to carbon from ... will come after you, all NG heater users also will come after you, all BBQ ... Can you tell CARBON from the flame itself? ... OK smart ass...What color is a natural gas flame when you cut of the air ...
    (sci.energy.hydrogen)
  • Re: Q, old unusual equipment
    ... > "Carbon Arc" welder, and has directions on the case. ... lot of time and a lot or passes to build up the welds. ... You put a carbon rod in each side, ...
    (sci.engr.joining.welding)