Posted by Janicholson on August 30, 2016 at 16:44:00 from (63.152.211.94):
In Reply to: OT gas welding posted by pat sublett on August 30, 2016 at 14:30:38:
Wear a Faraday cage on your torso. Wire mesh, (real wire screen wire would do). (Welding Principles old text book is needed) Gas welding has the following elements I suggest (I teach it): Rule 1 never ever let acetylene pressure in the low pressure hose get above 15PSI (watch a video on acetylene fires and compressed gas cylinders). For small tips use about 5 psi on acetylene, and 8 to 10 psi on oxygen. Adjust the flame for two colors one bright blue at the tip, and the other a more transparent envelope. The flame is tweaked so the middle flame is just gone. (more will cause the flame to hiss and be pointed.) If brazing the flame should have a tiny bit of that third flame poking out an eighth of an inch. (reducing flame) On larger tips use 8 Psi and 12 psi. For cutting, use 8 Psi and 40 psi for up to 1/2 inch. start and stop the flame on gas only. Turn up the gas until the flame begins to make a turbulent hiss and stays at the tip of the torch orifice. (If it jumps away from the tip, close the valve till it jumps bact to the tip. then add Oxygen to make the flame above. Use tips appropriate to the work. thin (up to 1/16, use #1 or 2. for 1/16 to 1/8th use up to #5 or 6. For thicker up to 1/4, use a #9 or so. Dont use a big tip to weld small things it will back fire. Don't use a small tip at higher flow or pressure it will jump away and blow out. Don't ream the orifice with the cleaning tips , excess reaming will bell mouth the hole and make it worthless. The flame tip should be about 1/16th to 1/8th away from the work and directed in the direction you are traveling with equal flame/heat on both sides of the work. That is a very short course. Jim
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