Recent content by MikeMet

In ASME Section II, Part C, Appendix A, A7.10, the description of E309 filler metal there is a cautionary note that states: Embrittlement or cracking can occur if these dissimlar steel welds are subjected to a post weld heat treatment or to service above 700C. I believe this had to do with...

I agree with others that getting a proper chemistry at 3mm with E316L filler may be a challenge. To overcome this we have at times used an over alloyed filler metal, such as ERNiCrMo-4 or -10, just for restoring the cladding at the seam welds. Typically in the as welded condition, even in thin...

Contact the good people at Dynamic Flowform. The can start with small hollows and make custom sizes. http://flowform.com/index.php

The short answer is yes. The minimum size of the weld, if a strength weld, is calculated using ASME Sect VIII, part UHX. However, there is no term or definition of "leak path" in Section VIII. So the leak path required by the design is undefined, but most people consider the weld size to be...

The attachment is something I have had for a while. Hope it helps.

To add, you will need to preheat to a very high temperature even for ductile iron. Consider a 500-650 preheat. The best option is to not weld unless you absolutely have to. Look into mechanical methods for attachment to elminate the cracking issues that can easily arise when welding any type...

You don't need water to prevent SCC on stainless steel in ammonia. It is typically considered resistant to ammonia stress corrosion cracking.

If you are repairing a discontinuity in a casting made of Alloy C276 you should make the weld using matching filler metal. That way the casting should have homogeneous properties (as much as they can be in a casting). As a customer that is what I would expect. Not a casting of one alloy...

Can't cast the entire turbine in one shot, but you can cast parts made of titanium. It's done every day

Let's not get too complicated here for no reason. Unless your component is going to be wet all the time or submersed, don't worry too much about galvanic attack. If there is a fire danger I would not use galvanized componets due to possible LME from molten zinc. If no fire danger, and not wet...

You also have to consider whether you can get materials in tubular form. UHDE and Bohler both make good high strength, polyethylene process tubing, but it not considered weldable by the code. You would be hard pressed to find someone who makes 17-4PH sst, or 15-5PH sst in tubing in small...

Need to settle an argument. Is phased array ultrasonic examination of welds considered a sophisticated version of shear wave examination? Or is it classified as something other than a shear wave examination?

We have had luck using phased array UT of nozzle fillet welds in duplex vessels. You will need a proper calibration sample to ensure relevant results.

Yes, ASME Code Committee members get code case information free. There have been some real problems trying to weld lean duplex tubes directly to carbon steel tube sheets. Recommendations are to use a high nickel filler metal to get good results. However, provided your clad is thick enough...

There is a method called Automated Ball Indentation that is a very fancy type of calibrated hardness testing that provides yield strength and fracture toughness data. http://ssmsystems.net/pdf/PVP170-2.pdf http://jjmie.hu.edu.jo/files/v4n4/JJMIE-14-09_Revised(9)/JJMIE-14-09_%20Modified.pdf...