What is the maximum thickness of steel this machine will weld?

Well since this welder can be operated on 115V or 230V it will depend which voltage you are connected to. on 115V the max current is 125amps which will relate to max 1/8" in a single pass. but if connected to 230V then you will be able to get the max of 200amps out of welder , which will relate to a 1/4" thickness in a single pass. these are both at a 25% duty cycle. Hope that helps

Looking at this, the lincoln tig 225, and the miller syncrowave 210. thoughts?

I love the square wave tig 200, I am no expert welder so my review may not hold water with the pros, but this unit is nice, and it is easy to use. and has performed very well for me without any problems, I have put about 40 hours on it so far without an issue.

Is the HF start only on aluminum? Or steel and stainless as well?

High frequency start is used to initiate arc while welding steel. High frequency will be continuous while welding aluminum. The machine will automatically adjust for the process you are using.

Does this unit come with everything in the picture? Ready to weld

It comes with everything pictured. All you need is an argon tank and welding rod

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Lincoln Electric Square Wave TIG 200 TIG Welder K5126-1

Lincoln Electric Square Wave TIG 200 TIG Welder K5126-1

Product ID: 20431222

⚡Dual 120V/230V input for versatile power

🎵Pulse feature with rhythmic filler metal control

🔄Adjustable AC Frequency & Balance for perfect aluminum welds

Description

🔥 Weld Like a Pro, Wherever You Go!

PULSE WELDING RHYTHM - Leverage the pulse feature’s steady drumbeat to control heat and improve weld quality faster.
MULTI PROCESS MASTERY - Switch effortlessly between TIG and Stick welding modes to tackle both delicate and rugged projects.
LIGHTWEIGHT PORTABLE - At just 46 lbs, take your welding craft anywhere without compromise.
PRECISION ALUMINUM WELDING - Fine-tune AC Frequency and Balance to clean and penetrate aluminum like a pro, mastering every bead.
PLUG PLAY POWER FLEXIBILITY - Works seamlessly on standard 120V or high-output 230V circuits for ultimate portability and convenience.

The Lincoln Electric Square Wave TIG 200 is a versatile, portable TIG and Stick welder designed for hobbyists and small fabricators. It supports both 120V and 230V inputs, features adjustable AC Frequency and Balance for superior aluminum welding, and includes a pulse mode for enhanced filler metal control. Weighing only 46 lbs, it combines professional-grade welding precision with unmatched portability.

Specifications

ASIN	B017DQ8DJ8
Best Sellers Rank	#2,090,155 in Automotive ( See Top 100 in Automotive ) #1,788 in TIG Welding Equipment
Date First Available	October 30, 2015
Item Weight	46.5 pounds
Item model number	K5126-1
Manufacturer	Lincoln Electric
Product Dimensions	19.25 x 10.75 x 14 inches

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