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  1. sepehr1007

    70-30 Copper Nickel Welding

    Thank you everyone, your input was much appreciated.
  2. sepehr1007

    70-30 Copper Nickel Welding

    Metengr, yes, immediately prior to use the rods are scrubbed with abrasive pads to remove oxidation, and wiped with lint free cloths soaked in acetone. We've considered residue from the acetone as a possible source of contamination; the intent is to try absolute ethanol, xylene and ethanol. HSE...
  3. sepehr1007

    70-30 Copper Nickel Welding

    Thank you for your replies! EdStainless, the oxygen in the purge is measured every few passes and is kept below 0.2%. The ambient temperature and humidity is controlled. We are using a 25 mm gas nozzle and lens, with a flow rate of ~30 cfph (sorry for mixing units).
  4. sepehr1007

    70-30 Copper Nickel Welding

    Hello, I have been working on a welding procedure for welding 70-30 copper nickel alloy (UNS C71500)using GTAW that will reduce the number of porosity related weld repairs on small diameter piping. The specifications we are working to are very exacting - internal pores larger than 0.5 mm are...

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