[dirtmidget33]

Okay this is a curiosity question. I tried to find info but didn't come up with much. When or why would it be better to use the B2 over the D2. I figure there different chemical make up has to give properties that are more desirable in certain situations, but what advantages and disadvantages make these two fillers needed in the world.

I got these chemical compositions from the Harris site

ER80S-D2
-Si - 0.5-0.8%
-Mn - 1.6-2.1%
-P - 0.025%
-C - 0.07-0.12%
-Mo - 0.4-0.6%
-S - 0.025%
-Ni - 0.15%

ER80S-B2
-Si - 0.4-0.7%
-Mn - 0.4-0.7%
-Cr - 1.2-1.5%
-P - 0.025%
-C - 0.07-0.12%
-Mo - 0.4-0.6%
-S - 0.025%
-Ni - 0.2%

Biggest difference I see is the added Cr in the B2 mixture so does anyone have an idea on when to use this mix over the other. I realized this is kind of trivial to most people Thanks in advance if anyone has input on this

[GreinTime]

Are you welding CrMo by chance? Someone will chime in at some point, but the only time I've personally used ER80S-D2 is at school when welding 4130. Lincoln had a good article on welding CrMo where they talk about using ER70S2 I believe rather than the 80 due to the fact that they wanted the impact critical welds to fail before the part itself to absorb the impact (iirc. I could be way off on their reasoning its been a few months since I read it lol)

[kiwi2wheels]

Your post got me curious and Googling I found some interesting info and opinions on these sites ;

http://www.millerwelds.com/resources/co ... oly-tubing

http://www.netwelding.com/Welding%204130.htm

http://www.rapidwelding.com/files/RA311650.pdf SD2

http://www.rapidwelding.com/dynamic/Cat ... &zl=3&sq=4 SB2

I've used the ER80S-D2, ( also pure 4130 and CMS 32 ) on 4130 and the ER80S-B2 ( as A32 ) when welding 25CrMo4 ( European equivalent, sort of, for 4130 ) to 1.7734 ( 15CDV6 ) which is a CrVa steel.

[dirtmidget33]

For 4130 I use ER70S2 the more experienced guys I know always said to use it do to elongation properties of It. Gives the joints ability to give some before stuff starts coming apart. I was just recently gonna start experimenting with some ER80S-D2 on some parts that the tensile strength would be more desirable and noticed this ER80S-B2 never hear about it and was wondering what purpose this filler would be good for. Not something I need but figured would be a good find out about might find a future use for it.