Resistance seam welding of Inconel 625

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I am resistance seam welding Inconel 750 with a 7b finish. Our supplier has run out of the material and will not get any very soon. He recommended Inconel 625 and sent us some saying the welding parameters would be very much the same. I am using an Entron 1000 on a z-bar welder. (Ugh!) I have varied current and head pressures with no luck so far. Any suggestions would be appreceiated!!!! Tks

-- Rudy O'Donley (rodonley@fele.com), February 07, 2001

Answers

Inconel 625 is a solid-solution nickle-based alloy whereas Iconel 750 is a precipitation-hardenable nickle-based alloy.

Weld time should be near the same. Weld force may be as muuch as 40% less. Weld current may be approximately 20% more.

To better help, we would need to know what defects are being experienced. This would give us the ability to diagnose your problems.

-- (bobballa@tjsnow.com), February 12, 2001.


Without detailed information on your current weld schedule and size machine utilized, it is very difficult to come up with a fix. I assume the machine was sized properly to start with and you were slightly modifying the existing weld schedule using coupons. Try setting up work grouping samples (minimum of 12) then destructive test and document the results. We have discovered MFDC Mid Frequency DC power supplies are excellent choices. Monitoring voltage changes in the secondary then automatically modifying secondary current to compensate for material & tooling variences improves process control.

-- RJ Bob Hosa (rhosa@taylor-winfield.com), June 27, 2001.

I think that a Hi Frequency approch would be much better For you. Medar weld controls makes a a good high frequency unit.

-- Dave Shorkey (dshorke@hotmail.com), January 18, 2002.

You should also look at the Intertron Model 3000 mid frequency. Its an excellent control

-- (tcvash@hotmail.com), January 13, 2004.

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