Posted by 135 Fan on January 29, 2010 at 13:14:48 from (68.149.56.30):
In Reply to: Re: Welding question posted by trucker40 on January 29, 2010 at 08:05:54:
I had another response but it went blank when I tried to post it? I now know why most of the other qualified, experienced welders don't respond to topics like this. It is because they are too busy pulling their hair out, rolling on the floor reading some of the absolutely ridiculous posts. Yes, ridiculous. The original post was a very good question. I will try to give a response in laymans terms so everybody can understand it. If it seems harsh, I apologize but someone needs to tell it like it is in order to stop the insanity. I never said MIG wasn't an acceptable welding process. Most people do not run spray transfer even if their machines are capable. You need to be up around 24 or 25 volts or more with high wire feeds. It isn't for all positions either. Short circuiting transfer does not put a lot of heat into the work and is very susceptible to cold lap and lack of fusion. It also common to have cold starts. That's why Lincoln was so late to come on board with MIG. The founder of Lincoln did not like it. For some applications short circuiting transfer is the best welding method. At least 80% of experienced welders would choose 7018 over MIG for the highest strength weld on a piece of equipment. This is based on years of welding experience using both processes. Flux-Core is a different process than MIG. The two are not interchangeable with each other. TIG when done by a highly qualified welder is by far the best welding process but is slow. 6013 is a poor choice of rod considering there are much better choices. For small light duty stuff or sheet metal they will work. They have the lowest penetration and strength of all stick electrodes. Putting more heat into the work while welding carbon steel gives more strength, not the opposite. Why are large thick pieces preheated if a colder weld is stronger? What does stress relieving do? It heats the weld up to about 1600deg. and slow cools it! MIG welds do not have to be chipped when doing mutipass welds. The silicon deposits on the weld surface will burn out. Not having to clean the welds is a big advantage of MIG. Flux-core does have to be cleaned for muti-pass welds unless it's metal-core wire that leaves no slag. Welds done right fail all the time. Not necessarily because of the weld. Parts can be abused and metal can fatigue after time. Why does every company working with Cats and excavation equipment also have a welding truck or welder they can call? Stuff cracks and breaks. Always has, always will. That's also why there are very strict requirements for critical weldments like nuclear power plants and pipelines, etc., etc. If you want to learn about welding, you should learn from someone who has the proper schooling, qualifications and practical experience. Not from someone with no schooling, no qualifications and very limited knowledge. If you wanted to be a surgeon, you wouldn't want to learn from someone who's only qualification was they di-sected a frog in Jr. high school. Flux-core does not penetrate an inch deep unless the joint was prepared that way. Flux-core can have deep penetration in relation to other processes but an inch deep? You wouldn't want a single pass weld with an inch of penetration. The weld would have too much filler metal resulting in a coarse grain structure in the steel and more than likely other serious flaws. More passes produces a finer grain structure and strength. MIG does have to be done indoors and not everthing can be brought indoors to fix.
I could go on but I hope this clarifies some things about welding for people that want to learn. If other's don't want to accept it, there's not a lot else I can do. Dave
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