primeweld tig225x banner 2

4130 and 4140 heat treat and filler

by David
(NC Charlotte)

Hello I have a piece of 4130 that I want to weld to 4140. what filler should I use and what gas (mix or pure argon)
both parts are over an inch thick and will require a preheat. I'm assuming 400+ degrees (f). Also after the weld how much heat is needed for heat treat and I assume slow cool, I was thinking sand or cat litter for insulation.

Thanks David


------------------------------------------------

David,

depending on the end use of the weldment, there are several choices.

http://www.interlloy.com.au/data_sheets/hollow_bar/4140.html

Filler metal could even be mild steel er70s2 if full hardness and strength are not an issue.

309 stainless rod could also be used and might be more crack resistant for this application.

the link above recommends a very high preheat

400 degree Celsius = 752 degree Fahrenheit
to slow the cooling rate.

4140 is often used for dimensional stability rather than complete strength and hardness being the main factors..
but If this is a critical weld, you should get engineering input.



Return to tig forum.

Enjoy this page? Please pay it forward. Here's how...

Would you prefer to share this page with others by linking to it?

  1. Click on the HTML link code below.
  2. Copy and paste it, adding a note of your own, into your blog, a Web page, forums, a blog comment, your Facebook account, or anywhere that someone would find this page valuable.