12% MN to carbon steel

[bogu]

I am currently working on a project where I have to weld a 12% Mn steel to a carbon steel and I am unsure of the type of welding consumable to use and if their are any tricks of the trade I need to be aware of. Also what would be an appropriate NDT method? The plates are 10mm thick and butt-welded. I need to inspect the weld area both internally and externally.

Thanks

 

[Simon55]

Sorry I can't get into specifics right now, but I have come across this situation before. A stainless steel electrode was used (with all the inherent problems) in this particular situation - and is probably the best bet for you also. As far as NDT, depending on the code/standard you have to produce the weld to (ie what quality is required). Ultrasonics will be almost impossible, as will be magnetic particle. Therefore the best bet is to use radiography.
hope this helps

 

[Goahead]

Hi,

you could possibly profit from the suggestions given in the following article:

http://www.twi.co.uk/j32k/unprotected/band_1/offhigh_case7.html

reproduced here for your convenience:

"To summarise, the rules for welding or surfacing manganese steel are as follows:

1. Remove any work hardened metal by grinding. This is important because work hardened manganese steel is more susceptible to embrittlement than it is in the soft condition. Areas that cannot easily be indented with a centre punch should be ground out.
2. Hard surface manganese steel or carbon steel parent metal with manganese steel containing 4%Ni (AWS EFeMn(a)). Alternatively, AWS EFeMn(b) containing 1%Mo can be used.
3. Weld manganese steel to itself or to carbon steels using either of the above electrode types.
4. Keep the heat input low with a maximum interpass temperature of the weld of 350°C. The temperature of the zone 12mm away from the weld should not be allowed to exceed 250°C.
5. When hardfacing thick sections of medium carbon steel or low alloy steel, or when welding manganese steel to these materials, preheating may be required to avoid hydrogen cracking of the HAZs of the hardenable materials. In these cases the hardenable steels should be buttered with a layer of 18%Cr-8%Ni stainless weld metal with preheat, if required, before deposition of the manganese steel.
6. If abrasive conditions as well as impact are present in service the manganese steel weld metal should have an overlay of hard alloy steel (500-600HV).
Copyright © 2001, TWI Ltd"

All the best.

http://www.welding-advisers.com/

 

[arunmrao]

Normally the plates will have lower C than a cast component. You can use the regular welding rods for 12% Mn steelto weld the dissimilar metals. We have done some jobs for screens and other such applications in a cement mill without any problem.