Recent content by cbert

Thanks.

Can someone suggest the best grade of stainless steel for use in a marine environment? Parts are not submerged. Some are turned, some are springs; low cycle life.

Anyone know what/if any issues there are trying to solder to IPC J-STD-001 and SAE soldering specs and still be compliant to RoHS?

I am welding 2219-T851 cylinders to a 2219-T851 manifold. I am having trouble finding rectangular barstock for the manifold. The size needed is 2.5" x 3". Any suggestions for another alloy that has similar strength and weldabilty for the manifold?

I've got a small cylinder of 3 in. OD, 2. in ID running a pressure of 2000 psi. I am familiar with hoop and longitudinal stress calculations. How do I calculate the von Mises stress?

I'm searching for a lower cost alternative to Vespel SP1. Application is a poppet to seal a small orifice. Temperature range is -65° F to 220 F, sealing air at 3000 psi. Not sure if PEEK or TORLON would be good down to -65?

Thanks to all of you for your detailed replies. I've received more info on the requirement from our customer. Heavy metals cannot be a part of the composition. I had previously said that the material must "melt" between 220F and 230F. A better description of what's truely needed is a metal that...

It's a two part question. First I need to know if a non-eutectic alloy exists (or can exist) that melts in the range listed and then a vendor experienced with such a material.

I need to coat steel tubing with a low-melt temp (220F to 230F) non-eutectic alloy. Does anyone know a vendor that does or can do this?

I am getting annealed 420F barstock for making turned parts. Tempering at 600 F then air cooling produces a tensile of 230ksi according to Mark's Handbook. I plan on doing the tempering in house in a furnace with an inert atmoshere. Can someone tell me the duration of the heat treat at 600F...

I have two small brass parts that are being used in a switching device. Current is about 5 amps for 30 milliseconds. When the parts are unplated I can get a very slight welding action as witness under a scope. Worst case is the parts stick together due to the minute weld. Can anyone suggest a...

Low is about 150 psi.I have since heard that Butyl has a lower permeability than EPDM and would be a better choice. Any thoughts?

Can someone tell me if and why peroxide cured EPDM is the best choice for the diaphragm material for a low pressure hydrogen regulator.

I need to convince a customer that a laser welded joint is as strong as or stronger than a dip brazed joint. We are joining two aluminum parts and I have flexability in terms of the alloys depending on which method is used. Does anyone know of any documentation comparing brazing versus welding...

Thanks for the leads. We're sealing hydrazine for a thruster valve. There's a cold one waiting for you in the clubroom!