hunter27
Pete
- Messages
- 837
- Location
- Lancashire UK
A friend has asked me to braze some non magnetic used stainless steel tube, it consists of a 600mm length of 50mm stainless tube with 2x 30mm stainless stubs brazed in one side and 2x 15mm stainless stubs brazed in the other side with end caps on the 50mm. All the tube is around 1 to 1.2mm wall thickness.
I started TIG brazing it but found when I blow in to it to test I was getting micro leaks that just moved around when I went over them. Eventually I scrapped this piece and started again using stainless tubing sourced from elsewhere thinking if I used oxy/ acetylene instead it would heat up a larger section at once but I am still having the same trouble. The micro leaks are not coming from the joints but next to them, it's like the tube has become porous and some appear as very fine cracks.
any ideas?
This won't be under any pressure or vibration if I manage to finish it.
I started TIG brazing it but found when I blow in to it to test I was getting micro leaks that just moved around when I went over them. Eventually I scrapped this piece and started again using stainless tubing sourced from elsewhere thinking if I used oxy/ acetylene instead it would heat up a larger section at once but I am still having the same trouble. The micro leaks are not coming from the joints but next to them, it's like the tube has become porous and some appear as very fine cracks.
any ideas?
This won't be under any pressure or vibration if I manage to finish it.