|
Hi Tim, Replace the "O" ring and look for any scoring inside the mixing body. Make sure the tip coupler collar is tight. Besure your not over heating the brazing tip that would burn the "O" ring. If this is the case then your probably trying to apply to much heat too fast for the orifice size. Whats too much heat? Well that depends on the joint design, the metal being welded and the tip size. With no oxygen mix, then acetylene flame should not leave the tip surface as it would with too much acetylene flow. At this point it would be maximum flow rate for that orifice size. As to joint design, you can "trap" to much heat for a given tip size. Sometimes a larger tip size needs to be used so you can hold a longer distance away from the work allowing the tip to cool. This is a common problem for most gas welders from rushing the preheat before welding. Slow down and use less heat but for a slightly longer preheat time. You will see that your molten puddle is more umiform and easier to control with this method thus a smoother uniform bead is produced. Example: I use a O size tip for welding 30ga metal as well as heating a 1-1/2" rod for bending. I very seldom have to change tip size. I use a #3 cutting tip. T_Bone
| 
