Today at work, I thought I would weld up a broken crow bar. What the heck are they made of? It sparked like steel from the grinder. When I welded It gave alot of excessive spatter, and acted like cast iron. I ran a bevel and multi pass with .035 flux core on it and the welds looked good. I tried it out on an immovable object when I was done. I gave it everything I had, and it seemed to hold. I was just wondering what type of steel it might be.
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That's a real good question...I have welded scores of them, but never did know what steel the were using. I do know it is very dense material, and they will break in the HAZ (heat affected zone) lots of times. Cast steel welds pretty much like HRS, (hot rolled steel) but it could be tempered, I suppose.
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The breakage usually occurs when somebody is trying to do something that the tool isn't made for. Like using a forklift to apply the pressure, or beating on it with a sledge hammer. Today was the sledge hammer that did this one in.Arbo & Thor (The Junkyard Dog)
The Next Loud Noise You Hear Is Me!
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Originally posted by Bob
I must lead a sheltered life. I have never had a broken crow bar. They seem to give quite a bit, but I guess they don't permanently bend ... so you just have to go to far and it snaps?
Bob
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Originally posted by morpheus
what's the difference between casting and forging ? from your description it sounds like force is the difference.
- jack
I am not a manufacturing engineer, but I have never heard of pouring metal to be forged. Casting is just that; pouring molten metal into a mold and letting it cool.
Roger, what kind of forging uses molten steel?Bill C
"The more I learn about welding the more I find there is to learn..."
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Originally posted by Bob
Rocky D,
Ah yes. I did that once to a 1/2" Craftsman breakover wrench: 250 ft-lbs on the rear axel nuts of a VW bug.
Someone did that 150 miles SE of you. Mag 4.8 quake just after 1 pm yesterday. Felt as far away as up past Oceanside.
Bob
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I once saw film clip of die lock chain being made. Amazing process. The steel as I remember it was bar just short of a liquid as formed into chain. All USN ships use die lock chain for their anchors. ASR21 and ASR22 Submarine Rescue ships carried enough chain to 4 point moor over submarine on bottom at 1000 ft. Miles of chain. Chain was so heavy they had to use 2 capstans to raise it from 1000 ft. They also had anchor chain for their normal ships anchors at each corner. You can't drop anchor over 90' and stop it with the capstan's brake it has to be lowered.
All of the other ASRs used wire rope for most of each leg of 4 point salvage moor. Layed the mooring out on deck so each leg could be droped as the ship traveled a race track course or a clover leaf course.
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John,
My bug is '73. Drove it to work today.
I took an 18" length of 3/8 flat bar and cut two 1/2" square holes in it. Standard torque wrench snaps in one hole, 1/2'"bar stock in the other drives the socket. Double the length means twice the torque so I do the 250 ft-lbs with half that reading on the standard wrench.
The part I thought was funny, was it is a castle nut and gets a cotter pin AFTER the 250 ft-lbs.
I snapped the breakover getting one of those off. The 1/2" bar stock is only good for about 1 or 2 tightenings before it distorts and breaks.
Bob
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