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It sounds like you two are saying the same thing (that is, micalbrch misunderstands rimmed as he suggested - or missed the "NOT permitted" at the end of Shmulik's post). Rimmed = CO bubbles allowed to form during cooling. Killed = aluminum or silicon added to capture the oxygen coming out of...

Can anyone tell me the difference between ST and RST designations from DIN 17100? We're supplying replacement parts based on an old drawing from a European manufacturer and this is a new one for me. I'm specifically interested in RST 52-3; I have a crossover chart that shows some RSTs as...

Thanks for the input everyone. HgTX, the Blodgett course looks especially good (especially at half the price of the ASME and ASM courses - I assume the difference pays for some combination of hands-on time and course materials). Now I just need to convince somebody else to pay for it...

@JoeTank: Yes, it does. Not a very big one though, if we're talking mm, or an enormous one if we're talking inches. Maybe cm? Anyway, it turns out the material was (CSA G40.21) 50W - it certainly didn't mention that anywhere on the MTR. Is that common? I've only glanced at a few in the...

I'm a mechanical engineer a couple of years out of school. I design and specify weldments from time to time as part of my work, but my only training with welds so far comes from on-the-job learning. Sidebar - why don't they cover the practical stuff in school? I feel like a welding course and...

Is there a good resource I can use to identify a steel by its chemical composition? I received an MTR from a vendor who wants to substitute a material, but there's no specification on it (unless "58 x 295" is a designation I'm not familiar with?) and it doesn't look like it matches anything in...