The best replacement for argon is nitrogen.

The best alternatives to argon are rated as following:
★★★★★  nitrogen
★★★★  krypton
★★★★  co2
★★★  neon
★★  argon co2 mix
★  xenon
★  c25
★  helium
★  argon
★  co2 welding
★  neon high frequency
★  krypton windows
★  krypton gas
  aether
  low e
  argoshield
  terran
  argon co2
  d2ckey
  co2 mig welding
  zenon
  co2 mig

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Speaking about argon, one probably shouldn't forget about mig welding.

Other search terms related to argon and their ratings are:
★★★★★ mig welding
★★★★ mig
low e
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argon
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