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4130 /75-95 class (yield/tensile) /SMAW process/ 1.5" thick plate

by Margo
(Edmonton, AB, Canada)

What is your recommended temperature for the following:

1. preheat temperature
2. interpass temperature

I use E10018-D2
1/8" root
3/16" fill



4130 in that thickness would seem to be for a very critical application.

if there is a welding code referenced for your project on drawings etc. that should stipulate preheat and interpass.

otherwise AWS D1.1 structural welding code for steel should provide that information

my guess would be somewhere around 500f for both but that is just from memory.

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