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  1. Capntom

    Steel quench tank, protect from surface rust ?

    We have a 300 Gallon steel tank. The tank is used for water quenching of heat treated parts. The parts are about 400°F going into the tank. The quenching media is 5% Glycol mixed with water. Temp of the water never gets over 100° F. We, as expected, are experiencing surface rust after we sand...
  2. Capntom

    Vacuum brazing aluminum heat sink?

    Our customer is asking us to Vacuum braze parts that we currently machine for him in the brazed condition. Some other company is brazing the assemblies now, but they are having QDC problems. We are a machine shop, but I have personally done Vac brazing before for Aerospace hardware, SS and...
  3. Capntom

    Dedicated wire brushes for GTAW ?

    Is it a NADCAP or PWA requirement that SS wire brushes used for preweld or interpass cleaning be identified for each unique alloy group?? Color coded or some other method. This would prevent cross contamination of alloys. I seem to recall it was but I can not find the reuirement anywhere.
  4. Capntom

    Contamination of Argon at the GTAW torch ?

    Our customer specification (RPS 184) states that we have to verify gas purity at the torch outlet. Either by O2 < 20ppm, Dew point < -40C or the subjective Titanium scratch plate. We received a quote for a Vaisala Dew Point meter that we can install in-line upstream from the torch, but nothing...
  5. Capntom

    DCEN Voltage for different materials, GTAW

    Is there any test for residual oxides left on the surface? I found a knotted rotary SS wire brush that works great in a pneumatic tool. The alloy really flows nicely after brushing. I am looking for a more pro-active test to confirm successful brushing. We changed to stringer beads and they...
  6. Capntom

    DCEN Voltage for different materials, GTAW

    Hello: I seem to recall a chart of recommended voltages when GTAW steels. I can not seem to find it anywhere, anybody have a link to it? Typically 300 SS was around 9.0 DCEN. The specific reason is that we are Welding Inconel 718 and are getting a 50%fallout from X-Ray. Inclusions mainly. I...
  7. Capntom

    What type of weld/braze is this?

    It looks like Silver Braze, Perhaps Bag-7 ? Pre-form filler wires are an excellent way to control the amount of filler in the joint. A reducing atmosphere, a positive pressure Hydrogen belt furnace would display this type of look on the finshed product. Its definately not torch brazed with...
  8. Capntom

    Time for TIG welding

    Frequently "torch time" is the shortest category in some welding. As stated what is included in that "two minutes" is the important number. What code? What service class or inspection criteria are required, how many passes, preheat, joint prep, paperwork to be filled out, material certs...
  9. Capntom

    Rust prevention on steel fixtures?

    What is a good product to spray on Steel fixtures for storage up to a few years inside in a warehouse in New England? Sizes are around 2 feet by 2 feet square, nothing monsterous. My predescesor has sprayed on WD-40 and after a few weeks there is RUST, Not good. At home and on my boat I have...
  10. Capntom

    Hot forming Inco 718 (AMS 5596)

    Hello, we need to Hot form some Inco 718 plate, .216" thick to a gentle radii for an engine strut. Imagine a 3 foot radius bend. Where can I find info on forming temperature, required tonnage etc.... I have never done Hot forming before. The Rolles Royce spec does not define the allowable...
  11. Capntom

    CNC Lathe cutting oil vs Water-sol coolant?

    My company has just purchased a Citizen L20 CNC Lathe for small parts. We spec'd a High pressure "cool Blaster" oil delivery coolant system with a "mist collection system". I have been out of machining for a few years and thought the trends were going towards Water-sol type coolants, any thoughts?
  12. Capntom

    Welding Aluminum, GTAW

    I am using a Miller Synchrowave 180 SD. There is no AC balance, or none that I can find. Can somebody help me locate it??? They do not have a manual either. The machine is a 2003 model that was hardly ever used. I have been somewhat successful welding in new gussets on clean surfaces. I...
  13. Capntom

    B&amp;PV Code Section IX requirements

    Hello All: I came from a Mil-278 background and my new job is asking about getting compliant with section IX for CRN Registration purposes. A few questions. As I read the code it does not appear to address joint design, base metals, inspections or welder training?? Are the requirements of...
  14. Capntom

    Welding Aluminum, GTAW

    I am helping a friend repair some aluminum racks that hold donuts. I am using 4043 Aluminum filler that is 3/32 dia. Base metal is .125 thick channel. 3/32 Dia Tungsten that is 2% Thorium. Tonight I am changing to Lanthanated. I grind away the oxide layer with a disk grinder, Al-oxide paper...
  15. Capntom

    SS parts that turn green in an furnace Braze cycle??

    I have seen this condition duplicate itself with other suppliers and Alloys. It is always with SS parts though.
  16. Capntom

    SS parts that turn green in an furnace Braze cycle??

    He is using Argon, I am not sure what flux, if any. I will check. The alloy is as follows: 0.015 C, 0.40 Mn, 0.90 Si, 0.02 P, 0.30 S, 17.5 Cr, 0.2 Ni, 1.75 Mo, 0.25 Cb, Bal. Fe Chrome Core 18-FM stainless is a soft magnetic ferritic material designed for operation in more corrosive...
  17. Capntom

    SS parts that turn green in an furnace Braze cycle??

    We have had a few furnace over the years that haved turned green after the furnace braze cycle. The heat treat facility thinks it is moisture but I am not sure. He says he pulls a hard vacuum and has good atmosphere. he does a furnace clean prior to our runs. He is mainly a Heat treater, not...
  18. Capntom

    10 pps vs 50 pps in GTAW Pulse??

    What output will this change when pulsing thin wall (.028)304 SS to a thicker flange (.375 wall) 430 FR Series SS?? We are an OEM and autogenously weld these assemblies. Our weld schedules have this variable ranging from 10 PPS to 50 PPS. I understand the relationship of peak, background and...
  19. Capntom

    Etching 303 to 430F Weldment, GTAW

    We have autogenously welded these two metals. I want to evaluate the weld interface, penetration and HAZ. My question is what chemical etchants do I use?? I have heard Aqua regia, HNO3 and Alcohol or a mixture of HNO3-HCl and H20? Which one or other would work the best?
  20. Capntom

    Slag in autogenous orbital welds 316L tubing?

    We GTAW sch 40 and 80 pipe all the time per MIL-278. Are you back filling the ID of the tube with Argon?? If not, I would start there. If the molten pool penetrates to the ID and does not have a protective environment it will look like slag to the Inspector. Could be classified as Burn...

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