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Welding 4140 Q&T to 1026 Seamless Tube
2

Welding 4140 Q&T to 1026 Seamless Tube

Welding 4140 Q&T to 1026 Seamless Tube

(OP)
We need to weld a premachined 4140 Q&T (131,000 psi yield) pin into a 1026 hrs seamless tube.  The pin is shrunk fit into the tube before welding, and the weld is just a secondary means to assure the pin does not work loose or spin in the bore.

Since the 4140 is quenched and tempered and premachined for bearings, I don't think PWHT is plausible.  In the past they have preheated to 400-450F and slow cooled and used E71T-1 wire.  Is this acceptable?  Sketch attached.

RE: Welding 4140 Q&T to 1026 Seamless Tube

E7018 H4R low hydrogen coated electrodes are also recommended with your stated preheat. A dehydrogenation heat treatment at 600F min for 2 hrs is recommended when using E71T-1 or its cousins, E71T-1M, E71T-12C, E71T-12M.

RE: Welding 4140 Q&T to 1026 Seamless Tube

Agreed. Make sure after welding you NDT the fillet weld using wet fluorescent MT.  

RE: Welding 4140 Q&T to 1026 Seamless Tube

Finally, the weldment could be locally tempered using properly designed induction heating coils and frequencies.

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