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That crack is no big deal. Why in the hell your instructor would tell you to cut out material and replace it with new is beyond ridiculous. He has no clue.

Clean up the area with a wire wheel or light grinding to get rid of the surrounding paint and any rust in the area. MIG or TIG welding the crack would both work. I would MIG it if it were mine. No need to drill a hole at the start and end of the crack. The weld will fix the issue and prevent spread of the crack. If you are unsure of your ability to weld it, take it somewhere to have it properly welded (muffler shop or body shop may be able to do it). It shouldn't cost much at all.
 

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Yep. Just clean it up. Practice on a piece of similar scrape metal to get your heat and wire feed set correctly and then weld it up. Let it cool a few minutes, clean up the weld and then spray a little black gloss Rustoleum on it... Done.
Its thin tubing and unless he has thin tubing to practice on he will be burning holes through it in no time and then he will have real issues. He might want to find a good setting and pulse weld it with the MIG.

This really isn't a good project for a newbie welder.
 
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