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Up Topic Welding Industry / General Welding Discussion / 4140 GMAW Weld
- - By marktski (**) Date 05-15-2014 17:06
I need to weld 2 4140 plates together, I was thinking 80S-D2. Does anyone have a better suggestion?
Parent - - By Superflux (****) Date 05-15-2014 17:55
80 ksi is a bit underpowered from my experience.
Back when I worked for XXXXX (in the 70's), we used 11018-C1 lo-hi stick for this material.
With a 650°F preheat for very thick stuff as in over 2" cross section on heavy castings.
YMMV
Parent - - By marktski (**) Date 05-15-2014 18:24
The specs on this filler are: 110 K tensile, and 95 K yield, good Charpys as well.
Boss wants to go with GMAW for good appearance.
Parent - - By Superflux (****) Date 05-15-2014 20:05 Edited 05-15-2014 20:09
SOooo...
How are you planning on getting 110ksi with 95K yield out of the filler metal originally posted???
Run some test samples, pull'em apart and see what you get. Don't forget to include the size and preheat into your inquiry.
Call/email your brand of rod/wire of choice and ask them for a recommendation.
That's what I would do.
Parent - - By marktski (**) Date 05-15-2014 21:29
I'm sorry, perhaps we misunderstood each other. 80S-D2 filler used with 98% Argon and 2% O2 has an as welded tensile of 110 K
and a yield of 95K per the manufacturers spec sheet.

I was asking for any other suggestions on a consumable to consider. 110T5 was suggested, but it does not run real pretty.
Parent - - By Superflux (****) Date 05-16-2014 17:45 Edited 05-16-2014 19:23
Mfg specs are well and good, but nothing supercede s a qualification test.
True, its a norm for a filler metal to exceed it's designated minimum tensile strength.
The problem is, that as carbon and metallic alloy ingredients increases for higher tensiles, ease of operation decreases. AND, bead appearance suffers too. Hence more definition of ripples and spatter size and quantity. There just aint no free lunch!
Why was the D2 suffix selected? Was it something the shop had on hand in the store room? Did that slick salesman at the LWS suggest it?
Dig through mfg specs and go for a higher nickel content for smoother beads.
Remember though, nickel = $$$$.
Parent - By js55 (*****) Date 05-19-2014 12:56
D2 is a commonly recommended filler. The expectation is that there will be dilution from the base metal that not only increases the strength of the weld but any corrosion properties as well.
The main issue with these alloys is the heat treat condition of the base metal. Heat treat will vary the ultimate strength. Depending upon the HT condition of the application base metal you may not need to achieve the full blown material strength.
Parent - - By kcd616 (***) Date 05-17-2014 05:14
pretty is not always better:eek::cool::roll::wink:
Kent
Parent - By Tommyjoking (****) Date 05-28-2014 04:09
pretty is not always better:eek::cool::roll::wink:

Ditto    It is one thing to have slick as possible looking weldments, it is quite another to have weldments that meet/exceed requirements.  Which is more important to you?>
Up Topic Welding Industry / General Welding Discussion / 4140 GMAW Weld

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