There are two knobs on the front of the welder. One knob is the wire speed control and the other is the voltage control. Depending on the thickness of the material you will adjust the two knobs. Instructions are included on page 11in the manual for proper adjustments.
Lincoln Electric WELD-PAK 90i FC Flux-Cored Wire Feeder Welder (No Gas) Kit, Model# K5255-1 with Large Metal Working Gloves, 0.035 Flux Core Wire, Model# K5387-7

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- WELD ANYWHERE: Plug in the Weld Pak 90i FC flux-cored wire feeder welder anywhere 120V input power is available
- LIGHTWEIGHT & PORTABLE: Ideal for maintenance and mobile welders, thanks to its small and lightweight inverter design and shoulder strap for portability
- 90i FC WELDER FEATURES: Easy to turn control knobs allow you to fine tune welding parameters; Conveniently load your spool of wire on top of machine; Automatic thermal protector shuts off output until machine cools to a normal operating temperature
- SMOOTH OPERATION: Inverter power source makes it more efficient to operate and provides smoother weld characteristics compared to traditional welders
- PERFECT FOR SMALL WELD JOBS: This machine is best for DIY projects, hobbyists, home repairs and more; Infinite welding voltage allows fine-tuning of weld characteristics; 30% duty cycle at 90 Amp; 20-120 Amp range
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