Page Comparison

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	4130 Chromoly	Cold Drawn Mild Steel (1018)
Weldability	Recommended to use TIG welding or nickel bronze welding (brazing) Requires pre and post weld heat treatment to normalize the structure after any weld, or becomes very prone to fracturing Can be problematic doing small attachments (brackets + other modifications) on the fly since every weld needs to be heat treated afterwards Recommended to be welded professionally	Recommended to be TIG or nickel bronze welded, but MIG works as well No heat treatment necessary post-welding
UTS (Ultimate Tensile Strength)	590 MPA	420 MPA
Elastic Modulus	Same	Same
Positives	Can use thinner walled sections in areas due to higher strength Better strength to weight ratio Less likely to be dented; higher structural integrity	Less expensive (by 50% approximately) Easier to weld (more options) and no pre or post welding necessary Better to use with a lack of welding experience
Other Teams	Principia

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Welding Process

Uses a thin wire as an electrode and filler fed by a wire feeder to the gun. Controlled by a DC power source
Has gas (MIG) or gasses (Flux core) option
Easier process to learn, but requires gas and wire feeder, making it less portable
Cost of MIG welder (small, used) ~$500

Very versatile and produces higher quality welds
Uses a torch and tungsten electrode, with argon as a shielding gas
Controlling the torch, wire feeding, movement and having the correct current makes it complicated
Takes a lot of practice to learn properly
Very precise, clean, and little clean-up required after. Grinding or smoothing not required
Cost of TIG welder (small, portable, used) ~$1200

Put into a furnace at a predetermined temperature and cooling rate
Pre-heat the metal prior to welding
Bring the welds up to 1100-1650 degrees and cool slowly to eliminate stresses and cracks

There are courses available at Waterloo and Conestoga if anyone is interested...
Generally, the university does not like for students to be doing welding on their own

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