Oxy-Acetelyne Brazing

[kkg123]

1. How much pressure should be kept for Oxygen & Acetelyne in Brazing? how it affects on Quality?
2. How to eliminate Brazing Porosity?

 

[TheBlacksmith]

Pressure is according to your torch's instructions, it can be as little as 3 psi each, but range up to about 10 psi - ACETELYNE SHOULD NEVER EXCEED 15 PSIG - IT CAN EXPLODE!

For porosity, you could have too active a flame - it should be "quiet", not hissing, you could be holding torch too close, try a larger size, you could be overheating the metal, hold torch farther away or try a smaller size.

Blacksmith

 

[tomwalz]

There can be advantages to adjsuting the gas ratios as well.

Porosity can be a surface cleanliness problem, trapped flux or overheating of the braze alloy which can boil out zinc, for example.

We have brazing info including some good pictures at

http://www.carbideprocessors.com

tom