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  1. etch

    Strontium For Aluminum-Silicon alloy modification

    Hello Its been a while since i used strontium, but il try and help out. You never said in what form you used strontium, i take it it was in rod or some other al:sr mix. Storage is never usually a problem in this form. I would say that you have either got one or two problems. 1) The wrong...
  2. etch

    Personal Air Sampling

    I am after some information on the method of Air sampling. We have a process where we can conduct both inhalable and respirable dust sampling. I am a bit confused on the subject of using a cyclone and the 50% cut-off point, doe sthat mean to get an accurate sample you would have to have the...
  3. etch

    Zinc Bar/Ingot

    i think AMC, ZUES and a few others supply ingot.
  4. etch

    Detecting porosity in Aluminium Castings

    You could always go down the cost of Real-time xray. We used to use it to check high value parts at $800-$1000 per casting, for aerospace. We had the similar problem of wasitn alot of time and possible money machining casting that would subsequently fail at later stages. Turn around times for...
  5. etch

    Aluminum Plate vs. Aluminum Open Die Hand Forgings

    This is a major annoyance for me. Material selection for jobs should be primarily undertaken by the experts ie the person making the component. We have had many times were we politely told customers that the material they required would be too expensive, would not run or would not rpovide...
  6. etch

    Selection of aluminum casting process

    For this type of run it would have to be sand casting id say.
  7. etch

    Aluminium self hardening alloy cast in sand

    The first part i cannot help with, but the second i can maybe offer some insight. Alloys with higher silicon content tend to have higher shrinkage. one way to combat this it to shift te eutectic of the alloy to the right, thus allowing a longer freezing range. there are two ways to do this, one...
  8. etch

    British Standards

    You never said what the properties were for, sand cast or chill cast?
  9. etch

    THREATENED WITH THE SACK

    Must be different over here, its quite common to sue for unfair dismissal, and having two people say there were no provocation against his word it pretty strong case
  10. etch

    Metallurgical Help Line - Is This Legal?

    Well basically Any ADVICE is that, its not a working instruction and certainly not a solution to the persons problems. Being a metallugist, i am happy to help out people where i can, and i think in general its good for your company to do the same, alot of small foundries and companies need...
  11. etch

    THREATENED WITH THE SACK

    Wait until its dark, then beat the crap out of him, when you wake up from you dream. you have two choices. one apologise and start looking for new work, or get sacked and both of you go to a lawfirm and sue his ass off for unfair dismissal.
  12. etch

    Fracture in A356 T6 alloy

    This reminds me of a casting returned to us after fracture. We produced these castings and the engineer and die deisgner failed to put a small radius on an edle giving the casting a stress raiser. the casting was returned to me with a clear fracture along this radius and 13 or 14 crescant...
  13. etch

    Scrap Metal and Market

    hmm depends where you are, generally there will be journals like recycling times and metal bullatine, that gives basic prices, these are only guideline as they are massaged by producers and scrap merchants i.e. i would offer to buy from you 20t of scrap cast aluminium. as a metal producer i...
  14. etch

    Govt. kickbacks for using recycled aluminum?

    id say it make common sense to use recycled aluminium where possible its generally cheaper, if not totally purer. to give you an insight i used to produce aluminium alloys in Scotland. our customer based went as far as atlanta alloy A380.1, japan, germany, switzerland and most of europe. With...
  15. etch

    aluminium-titanium alloys

    ok basically the titanuim is usally combined with boron, but not always. the titanium acts as seeding effect, on cooling the titanuim having a higher metling point colls down and acts as neucleating zones, the more titanium the greater the zones. These help promote smaller grains as they...
  16. etch

    Material build up on the die in extrusion

    okay here sia method we used, for castings, as well as coatings. On a refular basis, we blasted the dies with not sand or abrasive material but dry ice, this removed all crud and left die clean. it also reduced die temps. its quite expensive, but compared to time lost lifitng out dies to clean...
  17. etch

    shot peening of aluminum alloy

    we used to do shot peening on Aluminium Castings but here is a few strange concepts we used to peen swingarms for motorbikes and inlet manifolds for racing cars. Basically it was to give a good surface finish and remove any ....ahem suface defects. on the other hand shot peening of Aerospace...
  18. etch

    What does "safe" mean to you?

    Safe is to me FIT FOR PURPOSE
  19. etch

    Clarification on US and Canadian Engineers

    okay since i started it i better add my part now. I didnt want to create a riff between the us and canadian engineers. To be honest i just wanted to know the difference, here in the UK anyone can call themselves an engineer. Maybe you should all just accept that its the people that are skilled...
  20. etch

    Info on LM 11 alloy

    Lm 11 is a fairy obslete alloy that has sorta fallen by wayside, if you are still intrested in the properties i can dig out some old literature in my loft. I can give you good data on LM 11, are you based in uk or elsewhere?

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