Its because the metal is more brittle.Farm machinery is also like that from the late 1970s or early 1980s.High carbon steel I seem to remember.
Also welders have told me about the cracking and grinding and welding it back and Ive done it too.Also the higher strength rod is not going to help if its also low hydrogen,it will crack just as bad.
I have welded a lot on trailers and truck frames and farm machinery and stuff and you can weld it with 7018,but MIG works better.For some reason MIG stands up better for that kind of metal.
Also it will help it if you weld it as cool as you can,not burning it in.I learned from other welders showing me this stuff over years of working on trucks mostly.
What you say about undercut is true,but in this case 7018 is not so much undercutting as it is that the metal is stiff and something about the mixture makes it real hard with more heat and thats what makes it break easier.Thats what they told me and Ive seen it proved to me that was true.
Believe me its a pain to roll a big MIG around through a maze of air lines and broke down trucks to weld a 4 inch weld on something,but knowing it would last better than using the buzz box many times I have done it.Its a pain to weld with a MIG if you dont know how,and its also not easy to get where you need it,but everything on a truck that you can weld with it,its better to use a MIG on it,especially thinner metal.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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