Are the mufflers “back purged” during the welding process?
– “Back purge” is a method used during welding where the opposite side of the welding area is also filled with argon to replace the oxygen. The argon is kept at a constant flow rate to create an absolutely shielded environment for the melted metal on both sides. It is a time consuming method of welding, but I do back purge the RSR muffler while they are being welded. Below is a picture that shows the method that I use to back purge the mufflers. The tube is capped off with two rubber caps, one cap is fitted with a argon supply line and the flow rate is kept constant at 10-15 CFH, all the open seams of the mufflers that needs to be welded is taped up with masking tape, leaving only a small area opening waiting to be welded. I would peal back the masking tape one inch at a time as move forward with the welds.
