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Recent content by h2only

  1. h2only

    Sigma in Duplex Pipe

    The presence of sigma in duplex is quite possible, but very unusual, since duplex stainless steels are not used at temperatures that would promote sigma. If this has happened, then your corrosion resistance has suffered significantly also due to precipitation of other phases.
  2. h2only

    SCC Cracking in Inconlel 690

    I am looking at intergranular SCC in a piece of I-690, and I need some help/info with the following: (1) Metallography to determine possible sensitization. (2) Conditions that lead to sensitization. (3) Resistance to concentrated caustic (NaOH) w.r.t. SCC. Thanks in advance,
  3. h2only

    FCAW

    Flux cored arc welding required a rectifier-type DC constant voltage power source. These are made by Miller, Hobart, Lincoln, and everyone else. Inverters are suitable, but these are more expensive and there is no technical advantage other than light weight. Flux core is very tolerant of...
  4. h2only

    Copper Backup Bars

    Copper backing bars are perfectly acceptable on carbon and low alloy steel. I have also used these on 300 stainless steel (pipe long seams) and 5083 aluminum (ditto), as well as electroslag on carbon steel and CA6NM martensitic SS. I strongly recommend that you do your homework (i.e., trials...
  5. h2only

    Copper Backup Bars

    Copper backing bars are perfectly acceptable on carbon and low alloy steel. I have also used these on 300 stainless steel (pipe long seams) and 5083 aluminum (ditto), as well as electroslag on carbon steel and CA6NM martensitic SS. I strongly recommend that you do your homework (i.e., trials...
  6. h2only

    Head Bolts Torque Specs???

    Torque specifications for this type of thing would be for room temperature tightening, mainly because it isn't done any other way. Just be sure you are not using an inferior substitute (i.e., lower strength), and that you are sure you have the correct specified torque for your engine. The...
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