Mig Question..Need answer ASAP!

[Tim]

I need some advice. I have a mig test tomorrow, Vertical down
on Armour plated steel. The test speciman will be shipped to a lab to be X-rayed.

Is there any thing I need to know about welding this kind of steel?

Thanks
Tim Wolf

[Stu Bass]

plate test

Tim: Just keep it clean. Watch the corners, slight weave if you have to. revpol

[Guest]

How come you're welding armor plate? You going to Iraq?

In my school we had armor plate welding....but I was in the Army.

Burn into the root, and don't let the puddle get ahead of you.

[BillC]

Originally posted by Rocky D
How come you're welding armor plate? You going to Iraq?

In my school we had armor plate welding....but I was in the Army.

Burn into the root, and don't let the puddle get ahead of you.

SO, what's so special about welding armor plate??? What's the composition that requires a special welding procedure???

[Stu Bass]

mig question

Originally posted by Rocky D
How come you're welding armor plate? You going to Iraq?

In my school we had armor plate welding....but I was in the Army.

Burn into the root, and don't let the puddle get ahead of you.

Hey Rocky: That is very true you do want to burn in the root .That and the flush pass and cap pass are critical. Armor plate that I used to weld was mostly for clad welding coal piping and boiler hopper plating. Problems with squirt guns is you have to be careful about warpage. may have to run shorter stringers and backstep. Stu

[Guest]

Originally posted by BillC
SO, what's so special about welding armor plate??? What's the composition that requires a special welding procedure???

This is going back many years Bill, but as I remember it, armor plate is hardened on one side, and the thicknesses we were dealing with were anywhere from 2" to 12" thick. Like plugging a hole blown into a tank chassis. It required a double bevel, single vee joint and butter the sides of the joint, then fill it up with stringers. I think the filler metal was 7018, but I'm not sure ,it could have been greater like 11018. I never had to do any of it though. To this day, I can't imagine how to put a cubic foot of steel into an irregular hole in a tank chassis. How could you line it up to get a good weld on it? That would be difficult to say the least.

[Stu Bass]

mig question

Rock you are right. bevel and fill with 7018. 7018 keeps the elasticicy(?) in the aparent metal other wise it would just split again. Fit the joint usually with half clamps,dog&wedges,portapowers,or combo's of the three. Backing plates or even copper bar is sometimes used depending on the size of gaps. once filled clad with hard surface rod(armour rod) Stu

[BillC]

WOW, Sounds like a huge weld. No wonder Tim is being tested with MIG. So Tim, are you testing with Pulsed MIG or just short arc? What wire?

[Skaggydog]

Originally posted by Rocky D
Burn into the root, .

Isn't saying that redundant?

[Guest]

No, not from where I'm standing.

[Tim]

Mig welding armour plating

I really busted the test. Cant go into much detail but the job called for welding armour plated steel onto military vehicles. I was told that weldors with 20 years of experiance busted the test.
Good thing they want good weldors because there is a piece that goes under the vehicle and if it fails to hold up..Lives are lost.
Land mines dont care who are in the vehicle.
Tim

[Guest]

Tim, you will probably find that this will work out for the best. Is this a govt job you were trying out for?

[Sberry]

There is an old saying, just cause they been doing it for 20 years dont mean they been doing it right.