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  • Users: Capntom
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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

    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...
  6. 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...
  7. 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...
  8. 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?
  9. 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...
  10. 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...
  11. 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...
  12. 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...
  13. 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?
  14. Capntom

    Looking for Phase Diagrams

    Hello: I am looking for phase diagrams for steels. We are experimenting with using different Braze fillers and need to know at what temperatures the alloy goes through phase changes. Is there a web site or book I can purchase to aid and educate me??
  15. Capntom

    Putty-like material for superfinshing, where??

    Over the past few years I have seen a process that uses putty-like material that is impregnated with abrasive to give a smooth finish to geometrically challenged parts. The putty is forced in and out of the part causing a honing action. I can not think of or find the company name. Aerospace...
  16. Capntom

    A2 Hardening temperature

    I have Hardened and quenched simple O-1 tool steel tools before. Harden at 1550° and temper at 350°F. What are the time and temperatures for A-2, Air hardening tool steel, or is it even possible with tool room equipment. Natural gas or propane torches, thermocouples etc... I know we should...
  17. Capntom

    Bright dipping of brass, what chemically happens?

    We have brass parts that get Bright dipped. The line is composed of H2SO4, sodium dichromate and water. What is actually happening to the brass that reveals the cleaner luster? I have heard it "cleans and seals". Can someone explain in a few sentences?
  18. Capntom

    Argon gas lines, PVC tubing??

    We have an automatic GTAW welder that is having a problem with arc starting and Tungsten contamination. Its a Intellitig 4 by Miller. I just noticed that the lines that carry the Argon to the machine are PVC Type 1, grey plumbing tubing. Could that be contributing to the problem??
  19. Capntom

    95% Ar - 5% Hydrogen vs 100 Argon cleaner??

    Is the 95-5 a cleaner shielding gas as well as an aid to penetration?? I am welding 300 series SS to each other. GTAW, .060 wall. Where can I find onfo that educates me on these variables??
  20. Capntom

    Pressure test, N2, He or Compressed air??

    What are the biggest pros and cons about the media when low pressure (225 psig) pressure testing?? We are an OEM and have some cells that use Nitrogen, others use Helium leak detectors while others use the air under water method.

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