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  1. attilon

    Welding UNS N08020 to 316 SS

    If you want to make a heterogenouos welding, where at least one base metal is stainless steel, always use the Schaeffler diagramm. My first guess would be a high alloyed filler metal, for example Citochromax-R (this is Oerlikon), with Cr18%, Ni9% and Mn6%. This would give you almost for sure an...
  2. attilon

    Joining CrMo to CS

    Normaly I would use an austenitical electrode with 10%Ni,18%Cr, maybe with 1-3%Mn. The only problem is that after welding, you must use controlled cooling time. This should be such long that to not to let form martensite in the t8/5 cooling periode. In these cases martensite is public enemy...
  3. attilon

    Weld Capacity Between A36 and Forged Steel

    Hi, The people are right. Don't trust anything when it comes to lifting and rigging. But when you must deal with these kind of problems, you can always rely on old German welding school rules: 1. Modify your structure in a way that all welds should work only on compression. This way your weld...
  4. attilon

    Spotweld vs adhesive on galv steel

    Hi, You can try Sika Force 7780 (bi-component structural adhesive). This is what I use for our asian client for bonding the zinc coated sidewall plates into the sidewall frame for some goods transport wagons. Before that we used electro-rivetting (this is a MIG-MAG kind of spotwelding applied...
  5. attilon

    Cracked Cast Aluminum Block

    I repaired once a Mercedes 500 sport Al block by welding. I can tell you that it can be pretty tricky. First, it only worth doing it if that part of the block is not solicited dynamically. If that's the case, you can do the welding. Then as the others told, stop the crack with drilling holes at...
  6. attilon

    weld distance

    It depends of the current and voltage you will use to weld. The aim is that the Heat Altered Zones of the welds not to be in touch with each other. When you homologate the welds, the HAZ must be under 350HV, anyway, it is always higher than what you can measure inside the weld. If the second HAZ...
  7. attilon

    Powered slide-out ramp for citybus

    A big hello to everybody! We are working on a design of a citybus and the client wants exclusively a slide-out powered ramp for the boarding on the bus of the wheelchaired passengers. Our problem is that we can not find any supplier, and we need to be a European ramp supplier. If anybody knows...
  8. attilon

    Longitudinal Weld Metal Cracking

    hi, All the others are right, but: What is the main difference between Mig and Tig? The difference is the Linear Energy Introduced in the assembly. Now, if you had no problems with Mig, it means that the Energy (heat) input could be supported by the plate and the tube. (also it is possible...
  9. attilon

    Welding Engineering

    As I know, the American Welding Society is member of the International Welding Society, and the IWE Diploma was the idea of IWS. I think it is only a problem of will. I am sure, that there are AWS offices in every state. I think it's about AWS not wanting to accept the teaching methods of the...
  10. attilon

    Welding Engineering

    metengr; If your company is ISO or TÜV certified, when they come for the next audit, they will ask for the qualified personell, which also should be documented (and they do not recognize other then EWE or IWE Diploma). You don't show them the man with the Diploma, you're certificate is simply...
  11. attilon

    Welding Engineering

    Hello everybody! As I see, the welding issues are taken very differently in the US compared to Europe. According to the new rules, no company will be certified for any welding-type activity, begining with 2005, if they don't have personell that have EWE or IWE Diploma. You can call it...
  12. attilon

    What is the best engineering advice you ever received?

    PatrickR! A french engineer told me once, when I ask him about his very complecated design style: "The less people understand our drawings, the more they need us." :)) Cheers.
  13. attilon

    Regenerative Braking

    I worked three years for a trolleybus manufacturing company, it is standard equipment at trolleybuses, tramcars and metro-coaches in Europe. When braking, the electrical engine is the main brake, and only at lower speeds these vehicles use classical friction brakes. When braking, the electrical...
  14. attilon

    Responsibilities of Homologation group

    According to the law, if they present a homologation paper for that part (their supplied part) where it is stated that the part is complying with the Regulation No.... (This homologation paper is issued by an other certified testing institute like TÜV, or French Automotive Authorithy or such...
  15. attilon

    What is the best engineering advice you ever received?

    "When everything is going too well, be prepared for a very big problem, that you were missing in the big picture."
  16. attilon

    Responsibilities of Homologation group

    The responability of the supplier is to present for his delivered parts the homologation certificate accoring to the EU Regulation regarding that specific part. And you shouldn't test it. Now here comes the "dancing and music part": If you are homologating a new vehicle,you have to present at...
  17. attilon

    I have Autocad 2000 but no Igesout capability

    I had that problem too, a year ago. Download VariCAD from http://www.varicad.com You can use it for 30 days. It has this possibility. Bye!
  18. attilon

    Robotic welding aluminium

    Yes, you are right about the use of welding plates, you use them where you can, not everywhere. It really depends on the aplication you have. Also that's why I like welding. It can work in many ways, and then people wouldn't try something else if they already found a way. And they are right...
  19. attilon

    Robotic welding aluminium

    What 28021973 says about beginning the welding works if you weld manually, with the robot it is slightly other style. You attach a pair of weld-beginning plates in front and behind the seam (they are at least 50mm long) and you begin the welding on the plates, so the porous part will be on these...
  20. attilon

    Robotic welding aluminium

    Hi! Al has great heat conductibility. The equipment manufacturers such as Miller, Esab and Fronius have synergic database for welding. They have for aluminium too. If quality is most important, it depends on the legths of the weld. The longer you weld, the more heat you introduce the space...

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