Posted by 135 Fan on January 29, 2010 at 18:56:50 from (68.149.56.30):
In Reply to: Re: Welding question posted by trucker40 on January 29, 2010 at 13:12:23:
You are dillusional. Why am I biased because I'd choose 7018 over MIG for a repair that I wanted to be as strong as possible? I've done a lot of stick welding, a lot of MIG and a lot of Flux-core welding. It doesn't matter that I'm in Canada but since I am I can relate about quality standards here. Farm machinery is better welded with MIG and will take more vibration? What a load of crap that is. When I repaired a bogey assembly for the mindbender triple loop roller coaster, I ran a 6010 root with a 7018 cap. I repaired a bogey that had already been sent out for repair. The repair completely missed one corner. After explaining and showing the head millwright how bad the sent out repair was, he contacted a welding engineer to see about getting a procedure for repairing bogey's in house. Guess what the procedure was? 7018 preferably with a 6010 root pass, the exact way I had repaired it. I must have been psychic... or maybe, just maybe, I knew what I was doing. An independant inspector requested that he watch me perform the repair since there wasn't a procedure at the time. I'm not going to put people's lives in danger by hoping I get a good weld using MIG. There is a lot of stresses on a roller coaster and 3 people were killed on this one in the 80's when the cars came off the track. The designer/engineer had a heart attack after hearing that people were killed on his coaster. There is good bend in one of the support beams where the cars came off the track. The flange with the bend is on 3/4" thick steel! I think each car weighs a ton and there are 3 cars coupled together. There used to be 4 cars but they decided it was too fast with 4 cars and had too much G-force for the passengers. Roller coasters rely a lot on momentum and velocity. I don't remember exactly but it was thousands of tons of force when the cars came off the track. A special new bogey(wheel assembly)design was incorperated for this coaster and is the only type of it's kind in the world. All the repairs on the coaster, track and support structures have procedures for repairing them. Strangely MIG is never specified by the welding engineer but preheat is on the thicker sections. In certain applications 6011 would be a better choice than 7018 but to say 6011 is stronger is not correct. MIG is better than 7018 in some applications as well, like body work. I'd like to see someone weld 20 or 22 gauge auto body panels with 7018. You don't just crank the heat up with 7018 and go welding. You set it at the appropriate heat for the job. Most MIG/Flux-core welding is done on brand new steel with nice clean, perfect fit pieces in a controlled environment. Most repairs are done with stick. Stick will tolerate a lot more than MIG. You obviously don't understand that static and dynamic loading has everything to do with what rod and/or process is specified for a specific welding procedure. Can you give a better example of serious weld stress than a triple loop roller coaster? You can see the track and supports flexing when it is in operation. That is also designed into it so it doesn't shake itself apart. Bridges are a similar application that has to allow some flexibility. You seem more biased towards MIG than I do stick, Could it be because you have a MIG welder and not a stick welder? I used to have a stick/TIG welder and also a MIG welder. Which process I used depended on what I was welding and how strong I wanted it. With stick welding 7018 is most often the rod to choose if you're not sure what kind of steel it is or don't know what rod to use. That's not my thinking, it's common knowledge to people in the welding industry. If you can learn to do decent 7018 welds is most desirable. Dave
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