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  1. nousakmj

    YS and UTS for an all weld tensile specimen

    The yield and tensile strength for an E71T-1 weld deposit are not the same, but also not very far apart. The minimum specified yield is 58 ksi, the minimum specified tensile is 70 ksi and the minimum elongation is 22%. Yield usually runs somewhere around 65 to 70 ksi and tensile in the...
  2. nousakmj

    Welding 304SS to D6ac

    D6AC was hardly developed for use in the as-welded condition. The composition is basically akin to that of a 4145 with a some nickel added for ductility and the molybdenum cranked up for thermal stability. The nominal composition is 0.46 C, 0.76 Mn, 0.22 Si, 1.10 Cr, 0.5 Ni, 1.0 Mo, 0.08 V...
  3. nousakmj

    Welding 304SS to D6ac

    You will be hard pressed not to have the HAZ extend through the D6AC, but anything is possible with fine control. In theory, you can spot weld heat treatable alloys such as D6AC, but you'll have to include a temper cycle in the weld programming to avoid cracking. Otherwise, you'll simply watch...
  4. nousakmj

    Type 322 Stainless

    Is it possible you are looking for Type 332 stainless steel? Type 332 is a non-standard austenitic stainless steel as follows: UNS N-8800, Carbon .01 max, Manganese 1.50 max, Silicon 1.00 max, Chromium 19.0 to 32.0, Nickel 30.0 to 35.0, Phosphorus .045 max, Sulphur .015 max, Titanium .15 to...
  5. nousakmj

    4130 welding, need advice

    Just for giggles, a few more comments. It is hard to weld small diameter tubing using GMAW. The skills required to manipulate the electrode tip properly would usually require some level of automation. As noted by others, TIG (GTAW) or oxy-acetylene (OFW) would be the choices. Both require...
  6. nousakmj

    How many PQR's would be required

    For your purposes, the "S" numbers apply. The charpy impact requirement forces you into considering supplementary essential variables, but that isn't insurmountable. 15 ft-lbf at -20 deg C works out to 15 ft-lbf at -4 deg F. For FCAW, E7XT-1 is rated for 20 ft-lbf at 0F. If you...
  7. nousakmj

    Welding heat treated 4130

    If strength isn't a basic requirement for the drum, but hardness on the teeth, i.e. how hard you can bite, is the issue, then why not use carbon steel base materials for the drum and "tooth" stub, and then hardface the tooth -- or for that matter, simply create teeth using hardfacing...
  8. nousakmj

    4130 welding, need advice

    I don't know if this thread is dead or not, but I'm going to comment anyhow. My vantage point is that of a metallurgist and welding engineer, so I'll be more of a purist than apparently any of the other respondents. 4130 is a heat-treatable medium carbon steel with nominally 0.30% carbon...
  9. nousakmj

    Nitrogen as a backing gas for welding stainless steel

    I've used it successfully as a backing gas for both austenitic and duplex stainless materials, but you should be aware that the austenite - ferrite percentages may change since nitrogen will increase the amount of the austenite phase. If you have limits on on the pahse percentages, you'll have...
  10. nousakmj

    Welding heat treated 4130

    A 4130 filler metal is intended to be heat treated. In the as-welded condition, the weld metal deposit and the heat-affected-zones (HAZs) will both have lower strengths and hardnesses than the unaffected base metal. It is generally easier to weld annealed 4130 than a quenched and tempered 4130...
  11. nousakmj

    How many PQR's would be required

    If you were using these materials for a structural application, the A572 and A588 materials are listed, so welding them to themselves or each other would be prequalified for the SMAW, FCAW, GMAW and SAW processes within the limits of AWS D1.1. A333, however, would be considered an unlisted...
  12. nousakmj

    PWHT of Low Carbon Steel above 1330F; how detrimental?

    You're not going to do much to the base material at 1330 deg F -- certainly not for a 1020 material which will consist primarily of ferrite and pearlite. You shouldn't have to worry about austenite to ferrite transformations -- at the temperature you're talking about you won't have enough...
  13. nousakmj

    Double Groove Welding and ASME Section IX-00

    Joint design is not an essential variable for ASME SC IX except for some very specialized processes like electroslag, electrogas, or laser welding. If you already have a procedure qualified for welding P-No.43 materials with any other full penetration joint, you are already qualified to make...
  14. nousakmj

    Submerged Arc Welding Equipment

    The thickness range you plan on working within will should dictate the type of equipment. Anything under 1/2 inch should be a tiny-twin or single wire head with at least a 600 amp power source. Working in the usual range of 3/8 inch to 1 1/2 inches, a single wire head with a 600 to 1000 amp...
  15. nousakmj

    Martensite in HAZ...

    1. The presence of martensite is not necessarily detrimental unless, of course, you're concerned about ductility or impact properties. Your application and the strength level you seek in the weld deposit will determine it's acceptability. 2. Since tensile strength and hardness are directly...
  16. nousakmj

    Can someone provide me a table for

    The Machinery Handbook has tables of dimensions for metric (and non-metric) screws.
  17. nousakmj

    Where to get Material Specifications Online?

    If you're looking for standard ASTM ferrous and non-ferrous material specifications, go to astm.org and you'll be able to order copies of individual specifications or of the volumes of specifications themselves. The Society of Automotive Engineers also has a web site for their specifications...

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