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The Workhorse Model-300ST: Auto Start TIG / Stick Welder 20-400Amps

WORKHORSE : "A markedly useful or durable machine"...... Webster Dictionary

The Workhorse 300ST TIG WelderThe Workhorse TIGweld 300ST is a very rugged capacitor discharge, auto start TIG/Stick welding machine, weighing approximately 90lbs/41Kgs, and designed specifically for demanding TIG welding where the tungsten (wolfram) electrode is not allowed to touch the base metal which could cause contamination of the weld. The underlying design concept was to employ proven electrical and mechanical technologies and build a “no-nonsense”, cost-effective machine where usability, reliability and ruggedness are the most important design parameters. This in combination with a capacitor discharge auto start makes the Workhorse TIGweld 300ST a remarkable TIG machine. The single pulse starting the arc does not produce radio noise, which can interfere with cell phones and other communication systems. For this reason, the capacitor discharge TIG welder is a better solution than high frequency (HF) systems, which do cause interference.

The Workhorse 300ST
auto start TIG Welder and Stick Welder

  • Capacitor Discharge auto start TIG welder / Stick welding machine designed specifically for demanding TIG welding where the tungsten electrode (wolfram) is not allowed to touch the base metal which could cause contamination of the weld.
  • Exclusive 5-year guarantee against Corrosion-related failures
  • 10-400 Amps gives you all the power you need in an 80 lbs unit!
  • Constant power for TIG welding and Stick welding gives you great control with forgiving arc
  • Arc Ignition from 1/2" distance means no contamination of work piece
  • Capacitor discharge circuitry means no high frequency radio noise
  • Slope down function means better looking welds
  • Arc gouging up to 3/8" (10mm) in Stick mode
  • Solid fiberglass case for rugged environment
  • Corrosion Protection in all machines with 5-year guarantee
10-400 Amps gives you all the power you need in an 80 lbs unit! The Workhorse Stickweld 300ST -click for larger image
Constant power for TIG welding and Stick welding gives you great control 
with forgiving arc

Arc Ignition from 1/2" distance means no contamination of work piece

Capacitor discharge circuitry means no high frequency radio noise

Slope down function means better looking welds

Arc gouging up to 3/8" (10mm) in Stick mode

Solid fiberglass case for rugged environment

Corrosion Protection in all machines with 5-year guarantee
  • 10-400 Amps gives you all the power you need in a 90 lbs unit!
  • Constant power for TIG welding and Stick welding gives you great control with forgiving arc
  • Arc Ignition from 1/2" distance means no contamination of work piece
  • Capacitor discharge circuitry means no high frequency radio noise
  • Slope down function means better looking welds
  • Arc gouging up to 3/8" (10mm) in Stick mode
  • Solid fiberglass case for rugged environment
  • Corrosion Protection in all machines with 5-year guarantee

MECHANICAL DESIGN

The Workhorse 300ST provides exceptional ruggedness and durability in tough and demanding environments such as construction, shipbuilding, nuclear power plants, and offshore welding. The case is made out of solid fiberglass, which provides sturdier resistance to dents and forces than a sheet metal case.

ELECTRICAL DESIGN

The Workhorse 300ST uses an SCR inverter design for its power supply. The inverter design allows for an industrial welding machine weighing only 90lbs/41kgs. We have chosen the proven SCR component instead of the IGBT because of reliability. We have strong indications from the market that SCRs are up to 100 times more reliable in welding applications.

TIG Welding

The Auto Start feature allows no contact between material and torch. The Auto Start feature is therefore the best solution for critical TIG welding.

Smart Hot Start 

Brings the puddle temperature up quickly for good initial penetration. The amount of Hot Start is dependent on the weld puddle temperature. The Workhorse 300ST measures the time in between welds. The longer the period between stopping and starting, the greater the Hot Start current. If the arc is broken for less than a second, the Hot Start is eliminated. This prevents the puddle from overheating and burning through.

Thermostat-controlled Cooling Fan

The cooling fan starts automatically when welding current exceeds 100 A. If the current drops below 100 A, the fan will stop after approximately 6 minutes. If the fan is operating when the work is discontinued, the fan will continue to run and stop after approximately six minutes.


Option – The Warhorse

The Warhorse 300ST is a 400V or 480V welder designed to protect the machine from voltage spikes and over voltage surges commonly found in environments with very “dirty” power distribution system, such as power plants and shipyards and some generators.This high resistance to surges and spikes has been achieved by vastly increasing the capacity of existing surge protection circuits, adding new surge protectors and by using high voltage rated components in critical parts of the inverter circuits.


Safety, Warranty and Service 

The welding units are designed to meet UL551 and CE requirements. 
The units come with a factory warranty and user manual. 
Service will be taken care of by the factory or can in many cases be performed locally by your service authorized Distributor.

 
  • Very rugged capacitor discharge auto start TIG/Stick welding machine, weighing approximately 90lbs/41Kg
  • Designed for restrictive TIG welding where Lift Start is not allowed due to possible contamination of weld.
  • No high frequency noise generation due to single pulse arc starting.
  • Constant power means less dependence on steady hand for constant Arc length.
  • Constant power makes burn-through almost impossible.
  • Rugged fiberglass enclosure allows for rough handling in tough environments.
  • Digital read out simplifies current and voltage adjustment.

Product Specifications:

 

Primary
Input*
Rated Welding Current (AMPS) @ Duty Cycle Welding Amp Range Open Circuit Voltage Imput Amperes at Rated Load Output 50/60 Hz KVA
KW
Eff. Dimensions Weight
240V 400V 480V 575V Net Ship
Three Phase

400A @ 29%

300A @ 60%

250A @ 100%

Range 1

20A @10V
-180A TIG

10A @20V to 180A @ 27V Stick


Range 2

80A - 400A

80 max 37 25 20 18 14.9
12.05
79.60%

Height: 17.9"
(45.5 cm)


Width: 10.5"
(26.7 cm)

Depth: 19.5"
(49.5 cm)

Approx.
90 lbs.
(41kg.)
96 lbs.
(43.6 kg)
Single Phase 200A @ 28V
100%
45 NA NA NA NA NA
* 240V, 400V, 480V & 575V
Maximum output will be decreased when operating on 208 Volts AC.

Pricing & Packages

List Prices for Power Sources:
Model Description Model No. MSRP
Workhorse 300ST 240V 010320-043 $6015
Workhorse 300ST 400V 010320-041 $6015
Workhorse 300S 480V 010320-042 $6015
Workhorse 300ST 575V 010320-045 $6325
     
 Workhorse 300ST welder models with "Warhorse" voltage spike protection:    
Workhorse 300ST 240V 010320-143 $6780
Workhorse 300ST 400V 010320-141 $6780
Workhorse 300ST 480V 010320-142 $6780
Workhorse 300ST 575V
010320-145 $7095



Note: Dinse or Tweco output jacks are available
Please specify when ordering


  All machine prices include FREE SHIPPING to any location within the continental United States!
 Does not apply to accessories and / or parts, when order separately.


Welding Accessory Package
WP320-001 - TIG Welding Package
$600
• TIG torch, 150A air-cooled, 25’
• Work cable w/ 300A clamp, 15’ 2/0
• Remote amperage foot control
• AK-2 Torch accessory kit
• Gas regulator w/ flowtube & Gas hose, 15’


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