Armor Welding/ Homogeneous

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Okay WW experts... I need some good input. I am looking at a job that requires the use of MIL A 12560 homogeneous steel. I can only imagine that this material will give me problems with cracking. It does call out to use       ER70S-2... which I was surprised. I expected to have to use a tubular high tensile wire. Anyway, anybody out there have any experience? Your help will be welcomed with open arms. Looks like a no-quote right now.
Reply:There are 3 classes for that classification - CLI, CLII, CLIII. CLI - Homogeneous wrought armor plate up to 22" thick for maximum resistance to penetration.CLII - For maximum resistance to shock and vibration.CLIII - Specific hardness and impact values for the ammunition industry.Do you know which you're possibly going to work with?John -  fabricator extraordinaire, car nut!-  bleeding Miller blue! http://www.weldfabzone.com
Reply:Class 1 John... Thanks for the reply.
Reply:I can also tell you no tempering of the welds is allowed. Can you 10-99 me? John -  fabricator extraordinaire, car nut!-  bleeding Miller blue! http://www.weldfabzone.com
Reply:I know this is common sense but most times the criteria is specified by the company. When doing M1A1 Turrent mods, the welding must be in accordance with SD-X12140 Rev. D, which is a General Dynamics weld specification.John -  fabricator extraordinaire, car nut!-  bleeding Miller blue! http://www.weldfabzone.com
Reply:I can if you tell me some useful info!  I wanted to address pre-heat, post-heat, welding processes. Short Arc is exceptable on this project.
Reply:Welding is in accordnace with MIL-W-46086... which I know is a cancelled doc... like most MIL weld specs. The new spec is MIL-HDBK-1941. They dub it a "handbook". I think that's funny.
Reply:I should be able to temper after weld... can you explain your angle?
Reply:From what I've done, CLI doesn't call for tempering. When you get into CLII, this specifies tempering. edit - I suppose this is dependant upon what the contractor requires. Most applications don't call for it. The MIL-STD-1941 was updated in 2004, so it should be correct for your precedure ...if it calls to weld to that spec.Last edited by MicroZone; 12-28-2007 at 03:37 PM.John -  fabricator extraordinaire, car nut!-  bleeding Miller blue! http://www.weldfabzone.com
Reply:It doesn't call for that spec specifically. I followed the superceeding trail. That's "kind of" what I was looking for. Someone who has used this material and could tell me if they had experienced cracking problems with it. I have went through all the specs and done my homework. I was looking for actual first hand knowledge of using this material and it's tendencies. The spec is very clear that tempering can be used in the right doses. I would rather not have to do it and if I had too... to compesate for it (tempering). Thank you for your responses John. What's up with the link? Another "Welding Web"?
Reply:Exactly, the tempering takes more time. In our instance it didn't call for it. It was more of a light duty application. I would imagine if you're actually doing a contract for apv's or something similar, it will call for it. Yes, another warm and comforting spot on the web that welcomes all types of metal workers. I see you guys have a listing under "career" for a welder. PM me your number and perhaps we can talk. John -  fabricator extraordinaire, car nut!-  bleeding Miller blue! http://www.weldfabzone.com