Those are test coupons from a pipe weld. After welding, the pipe is cut in strips, ground flat with slightly rounded corners and then bent 180 deg's. You're generally allowed about 1/8" total allowable flaws adding all the bend tests together. If you grind it too much can fail before they are even bent. If you look close, you'll see that 2 of the bends are bent from the inside (root) of the pipe and the other 2 are from the outside(face) of the pipe. The pipe is all welded from the outside and you need 100% penetration, however if you have too much penetration, it will also fail before being bent. That's why some welders can make the big bucks.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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