tig problems

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why could cause a tig weld get gas pockets in it?Dynasty 200DXPassport plus w/ spoolmate 100victor 315c oxy/(act and prop)Miller digital elitemilwaukee power tools
Reply:Hello Turk, you have asked a pretty open ended question, but here are a number of things for you to consider:1. you might be using contaminated filler rod, might have oil, grease, solvents, or other contaminants on it.2. In some cases, using an RG 45 rod instead of one of the ER70S-X series rods could cause it.3. You could have a bad seal or o-ring somewhere in the gas delivery system. Check all connections on the gas bottle valve, regulator, connecting hoses, adapters, anything that makes up the gas delivery circuit.4. If you have recently changed any of the hoses in the system you need to be aware that there are some hoses that incorporate oils in their composition and if they are used for transferring shielding gases you will see contamination in the welds.5. Be sure that the collet that secures the tungsten in the torch assembly is installed in the correct direction. If it is installed backwards you may still feel or hear the shielding gas but it might be disrupted and turbulence could be present as a result of putting the collet in backwards. 6. Do not use excessive flow rates, this could cause excessive turbulence in the shielding gas envelope or act as a venturi system and actually draw external atmosphere into the weld area and contaminate the weld pool.7. Do not use insufficient flow rates, too little gas will not prevent the outside atmosphere from getting into the weld zone and contaminating the weld pool.8.Contamination of the parent metal will also cause porosity in a GTAW weld bead, insufficient removal of rust, surface oils, pickling agents, machining fluids, rust-inhibitors, certain types of solvents, etc. will possibly cause porosity in GTAW weld beads.      There are likely a number that I have missed here, possibly others will include them. A bit for you to consider. Best regards, Allanaevald