The best replacement for arc welder is mig welder.

The best alternatives to arc welder are rated as following:
★★★★★  mig welder
★★★★  wire feed
★★★★  mig
★★★  wire welder
★★★  inverter
★★  tig welder
★★  stick welder
★★  flux welder
★★  flux core
★  flux
★  inverter arc welder
★  tig
  spot welder
  gasless mig
  flux wire welder

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Speaking about arc welder, one probably shouldn't forget about tig.

Other search terms related to arc welder and their ratings are:
★★★★★ tig
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arc welder
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