BossWeld MST185 Manual
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BossWeld MST185 Manual

Inverter mig/tig/stick welder
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MST185
INVERTER
MIG/TIG/STICK
WELDER
MANUAL
10AMP
PLUG
2
YEAR
LIMITED
WARRANTY

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Arnel Barba
July 29, 2025

is it 50hertz - 60hertz? I bought mst 185 and planning to send it to the Philippines. Thank you

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Summary of Contents for BossWeld MST185

  • Page 1 MST185 INVERTER MIG/TIG/STICK WELDER MANUAL 10AMP PLUG YEAR LIMITED WARRANTY...
  • Page 2 The BOSSWELD MST185 is the latest in IGBT welder technology, this lightweight multipurpose welder is very simple to set up and operate enabling the user to complete high quality welds in MIG Gas / Gasless and MMA / Stick electrode as well as DC TIG processes.

  • Page 3: Table Of Contents

    CONTENTS PAGE WARRANTY BOX CONTENTS WARNINGS MACHINE CARE / SAFETY INSTRUCTIONS WORK AREA SAFETY MAINTENANCE & DISPOSAL / GAS BOTTLE FRONT & REAR PANEL LAYOUT MACHINE CONTROLS PANEL MACHINE INSIDE WIRE SPOOL & WIRE FEED SET UP MIG TORCH SETUP LINER INSTALLATION / REPLACEMENT DRIVE ROLLER SIZE 2T / 4T TRIGGER CONTROL INFORMATION...

  • Page 4: Warranty

    7. Use on Incorrect voltage or non authorised electrical connections and plugs 8. Use of non standard parts 9. Repair, case opening, tampering with, modifications to any part of the item by non authorised BOSSWELD repairers. This warranty covers the machine only and does not include Torches, Leads, Earth Clamps, Electrode holders, Plasma Torches, Tig Torches and any of the parts on those items unless there is a manufacturing fault.

  • Page 5: Box Contents

    BOSSWELD MST185 Inverter DC MIG Welder Box Contents BOSSWELD MST185 Inverter MIG/MMA/TIG Welder 3 metre 15 Series MIG Torch Electrode Holder Lead Welding Earth Lead Gas Hose Dual Stage Argon Regulator Torch Spares Drive Roller (Installed in Machine 0.8-0.9 V Groove) - not shown.

  • Page 6: Warnings

    WARNING The device and packaging material are not toys! Children must not be allowed to play with the machine and its accessories. Plastic parts and packaging are choking risks for children. • Open the packaging and remove the welder carefully. •...

  • Page 7: Machine Care / Safety Instructions

    MACHINE CARE / SAFETY Keep the welding cables, earth clamp and electrode holder in good condition. Failure to do this can result in poor welding quality, which could be dangerous in structural situations. Prior to use, check for breakage of parts and any other conditions that may affect operation of the welder. Any part of the welder that is damaged should be carefully checked to determine whether it will perform its intended function whilst being safe for the operator.

  • Page 8: Work Area Safety

    WORK AREA Ensure a clear, well lit work area with unrestricted movement for the operator. The work area should be well ventilated, as welding emits fumes which can be dangerous. Always maintain easy access to the ON/OFF switch of the welder, and the electrical mains supply. Do not expose the welder to rain and do not operate in damp or wet locations Where welding must be undertaken in environments with increased risk of electric shock, confined spaces or in the presence of flammable or explosive materials, it is important that the environment be evaluated in advance...

  • Page 9: Maintenance & Disposal / Gas Bottle

    IMPORTANT! - We strongly recommend that you check for gas leakage prior to operation of your machine. We recommend that you close the cylinder valve when the machine is not in use. BOSSWELD, authorised representatives or agents of BOSSWELD will not be liable or responsible for the loss of any gas.

  • Page 10: Front & Rear Panel Layout

    FRONT PANEL 1. Control Panel - See page 11 2. Euro Torch Connection Socket 3. Positive Output Connection Socket 4. Negative Output Connection Socket 5. Tig Torch Control Socket 6. Gas Output (for TIG process) REAR PANEL 7. Mains Power Switch 8.

  • Page 11: Machine Controls Panel

    CONTROL PANEL Welding Method Voltage , Arc Force and Downslope Display Press to select MIG / MMA Stick / TIG • Displays the Welding voltage when machine Welding Mode is in MIG • Press to select 2T or 4T • Displays the Arc Force when machine welding mode (MIG / TIG) is in Stick / MMA...

  • Page 12: Machine Inside

    SIDE PANEL (DOOR OPEN) A. Spool Hub B. Spool Hub Nut C. Polarity Switching Terminal D. Drive Roller E. Drive Roller Retainer Nut F. Wire Inlet G. Wire Guide Inlet Tube H. Wire Feed Tensioning Adjustment Idle Roller / Wire Tensioning Arm SETTING MACHINE POLARITY DCEN - GASLESS DCEP - GAS...

  • Page 13: Wire Spool & Wire Feed Set Up

    SET UP OF WIRE SPOOL & WIRE FEED UNIT Remove the Drive Roller Cover. Check Open the side door of the machine. the Drive roller is matched to the wire size for the job Note: Correct wire side on roller to face into machine when fitting.

  • Page 14: Mig Torch Setup

    SET UP OF MIG TORCH Attach the Euro Connect MIG Press the trigger. This will feed the torch to the machine feeding the wire through the torch. wire into the liner. Release button when wire appears at the end of the torch. Tighten MIG Torch connector to machine.

  • Page 15: Liner Installation / Replacement

    MIG TORCH LINER INSTALLATION / REPLACEMENT Re install tip and tighten Carefully feed the new Lay the MIG torch out using the tool provided liner into the torch lead all straight and flat on the and re attach nozzle to the way out the end of the ground and remove the torch.

  • Page 16: Drive Roller Size

    Ten minute period. The power source is protected by a built in temperature protection device, This will activate if the machine is operated in excess of its amperage and duty cycle rating. This light indicates Over temperature / Duty cycle exceeded BOSSWELD MST185 610150 IEC 60794 Duty Cycle...

  • Page 17: 4T Trigger Control Information

    2T / 4T TRIGGER CONTROL 2T Trigger Control 1. Press the trigger and Hold 2. The set pre-gas flow starts and the arc starts and will upslope to the amperage selected on the amperage dial. 3. When you want to finish the weld, release the trigger and the amperage will begin to downslope at the rate you have selected on the downslope dial, If you selected zero the arc will stop as soon as you release the trigger.

  • Page 18: Mig Torch And Consumable Care

    MIG torch parts. This silicon free compound is used to prolong the life of nozzles & tips. Bossweld 8 Ways MIG Welding Pliers (Part No: 800074) Handy 8 function welders pliers. Functions include, nozzle removal, tip removal, cleaning inside of nozzle...

  • Page 19: Stick / Mma Welding Setup

    MACHINE SET UP STICK/MMA Note: The below image shows setup for DCEP / Negative Polarity (Most Common application) 6.Select Stick / MMA mode 3. Connect earth Clamp to the terminal 2. Connect Electrode holder to the terminal Plug the machine 10Amp input power lead into Connect earth clamp firmly to work-piece the wall socket, ensuring that the power ensuring that the clamp makes good contact...
  • Page 20 MACHINE SET UP STICK/MMA - CONTINUED Ensure the electrode/electrode holder is not You can adjust the Arc force by using voltage near the work-piece or can earth out, turn the Parameter adjustment knob. machine on using the mains power switch. The front displays will light up and the cooling fan will start.

  • Page 21: General Mma Welding

    MANUAL METAL ARC PROCESS (MMA WELDING) When an arc is struck between the metal rod (electrode) and the workpiece, both the rod and workpiece surface melt to form a weld pool. Simultaneous melting of the flux coating on the rod will form gas and slag which protects the weld pool from the surrounding atmosphere.

  • Page 22: Gasless Mig Welding Setup

    MACHINE SET UP GASLESS MIG WELDING 8.Select MIG mode 4. Connect MIG Torch to the Euro Connection terminal NOTE: Ensure connector nut is tighten firmly 6. Connect earth Clamp to the terminal Plug the machine 10Amp input power lead into Set up the wire feed unit as per section “Set the wall socket, ensuring that the power up Wire Feed Unit”.
  • Page 23 MACHINE SET UP GASLESS MIG WELDING CONTINUED Ensure the polarity is correct for gasless Press the Welding Mode Selection Button until welding, DCEN the MIG indicator is lit. SETTING MACHINE POLARITY DCEN - GASLESS DCEP - GAS Remove nozzle and tip from torch and press trigger on the welding torch, this will feed the wire through the torch.

  • Page 24: Gas Mig Welding Setup

    We recommend that you close the cylinder valve when the machine is not in use. BOSSWELD authorised representatives or agents of BOSSWELD will not be liable or responsible for the loss of any gas.
  • Page 25 MACHINE SET UP GAS MIG WELDING CONTINUED Plug the machine 10Amp input power lead Install Euro connect MIG torch over the into the wall socket, ensuring that the power protruding wire, line up the spring connectors switch on the machine is in the OFF position. and screw the Euro connector nut up firmly.
  • Page 26 MACHINE SET UP GAS MIG WELDING CONTINUED Re install tip and nozzle to torch and trim wire Switch the machine on using the mains power to the end of the nozzle. The multifunction switch. Wait a few seconds whilst the machine digital display will show two numbers.
  • Page 27 MACHINE SET UP GAS MIG WELDING CONTINUED Fit gas regulator to the gas bottle and install gas hose to the gas inlet on the back panel of welder. Turn on regulator and set gas flow to between 10-15 L/min depending on your welding environment.

  • Page 28: General Mig Welding

    BASIC MIG WELDING GUIDE The welding power supply has two control settings that have to balance. These are voltage control switches and the wire speed control. The welding amperage is determined by the voltage settings, the wire diameter, gas selection and the wire feed speed. The amperage will increase with higher voltage selection on the machine and higher wire feed speed.
  • Page 29 Welding Wire Selection Guide WELDING WIRE SELECTION GUIDE Carbon Steel Mig Wire, Gas Shielded Gasless, Flux Core Wire 0.6mm 0.8mm 0.9mm 1.2mm 0.8mm 0.9mm 1.2mm 30-45 45-60 50-60 60-75 70-80 50-65 70-105 90-110 90-110 70-90 75-90 120-130 120-130 90-105 95-120 135-150 135-150 110-135...
  • Page 30 MIG WELDING SETTING GUIDES Welding current Welding Volt Wave control Wire Speed (Wire Size) 0.6mm 0.8mm 1.0mm 13~15V 2--3 14~16V 3--5 2--3 15~17V 6--8 3--5 2--3 100A 16~19V 8--10 3--6 120A 17~20V 4--7 3--5 140A 19~21V 5-10 5--8 3--5 160A 20~22V 5-10 6--9...
  • Page 31 GMAW (MIG) WELDING CONTINUED SHIELDING GAS In addition to general shielding of the arc and the weld pool, the shielding gas performs a number of important functions: • forms the arc plasma • stabilises the arc roots on the material surface •...
  • Page 32 We strongly recommend that you check for gas leakage prior to operation of your machine. We recommend that you close the cylinder valve when the machine is not in use. BOSSWELD authorised representatives or agents of BOSSWELD will not be liable or responsible for the loss of any gas.
  • Page 33 MACHINE SET UP TIG WELD - CONTINUED Fit the Earth lead Dinse Plug to the positive To adjust the Welding Current rotate the knob terminal for gasless welding and then connect to the desired Amperage. earth clamp to the work piece ensuring that the clamp makes good contact with bare metal.

  • Page 34: Tig Welding Setup

    WORK PIECE WORK PIECE WORK PIECE WORK PIECE TUNGSTEN PREPARATION & GRINDING Grinding creates the greatest hazard as the exposed tungsten/thoria area is greatly increased and fine particles of potentially radioactive dust are released into the atmosphere. It is recommended that a dedicated grindstone with local dust extraction is used, and a simple filter mask is worn.

  • Page 35: General Tig Welding

    WORK PIECE WORK PIECE TIG WELDING - CONTINUED This risk can be minimised using the ‘lift arc’ technique where the short-circuit is formed at a very low current level. The most common way of starting the TIG arc is to use HF (High Frequency). HF consists of FLUX COATING high voltage sparks of several thousand volts which last for a few microseconds.

  • Page 36: Bz15 Mig Torch Parts Break Down

    BZ15 BOSSWELD BINZEL STYLE MIG TORCH COMPLETE & SPARES ECO MIG TORCH HEAVY DUTY MIG TORCH PART NO. DESCRIPTION PART NO. DESCRIPTION 92.EC.15.3 BZ Style 15 Eco MIG Torch 3m 92.ER.15.3 HD BZ Style 15 MIG Torch 3m 92.ER.15.4 HD BZ Style 15 MIG Torch 4m 92.ER.15.5...

  • Page 37: Series Tig Torch Breakdown

    BOSSWELD 17 SERIES 150AMP TIG TORCH COMPLETE & SPARES BACK CAP INSULATOR PART NO. DESCRIPTION 95.17.4.1.MST185A TIG Torch 17, 4mt, 1 pc, Switch, Dinse 50 COLLET TORCH BODY 95.17.8.1.MST185A TIG Torch 17, 8mt, 1 pc, Switch, Dinse 50 COLLET BODY GAS LENS COLLET BODY PART NO.

  • Page 38: Helpful Information & Trouble Shooting

    “+” earth Flux core Wire Aluminium 3m only for push torch, Teflon liner, “U” groove roller, alloy tips or one size larger, argon shielding wire For Further Tips and Information please visit Bossweld TV Scan here to visit Bossweld TV...
  • Page 39 TROUBLE SHOOTING Issue Possible Reason Suggested Remedy Power indicator is not lit, • Welder is not plugged into • Check that the welder is plugged into the fan does not work and no power supply 240V mains outlet and is switched on. output current •...
  • Page 40 • Remove materials like paint, grease, oil, and dirt, including mill scale from base metal No gas flow (TIG) • Gas Regulator is off or Check Regulator pressure too low • Something caught in the valve • Remove • Solenoid valve is damaged, • Contact BOSSWELD hotline...
  • Page 41 MIG WIRE FEED TROUBLE SHOOTING The following chart addresses some of the common WIRE FEED problems during MIG welding. Issue Possible Reason Suggested Remedy No wire feed • Wrong mode selected • Check that the TIG/MMA/MIG selector switch set to MIG position Inconsistent / interrupted •...

  • Page 42: Welding Consumable / Accessories

    Bossweld Multi Pack Tungsten Electrodes - 10 Pack Bossweld Multi Pack Tungsten Electrodes contains 2 x 1.6mm Thoriated, 2 x 2.4mm Thoriated, 1 x 1.6mm Ceriated, 1 x 2.4mm Ceriated, 1 x 1.6mm Zirconated, 1 x 2.4mm Zirconated, 1 x 1.6mm Lanthanated, 1 x 2.4mm Lanthanated...
  • Page 43 MACHINE CONSUMABLE OPTIONS CODE DESCRIPTION 110160 680 Dissimilar x 2.6mm x (25 Pkt) 110170 680 Dissimilar x 3.2mm x (25 Pkt) 110190 Stainless Steel 316L-16 x 2.0mm x (25 Pkt) 110210 Stainless Steel 316L-16 x 2.6mm x (25 Pkt) 110230 Stainless Steel 316L-16 x 3.2mm x (25 Pkt) 110240 General Purpose 6013 x 1.6mm x (25 Pkt)
  • Page 44 Version 1.0 2019 OTHER PRODUCTS IN OUR RANGE • ELECTRODES • MIG WIRE • TIG RODS • GAS EQUIPMENT • WELDING HELMETS • WELDING SAFETY • WELDING MACHINES • MIG TORCHES • TORCH SPARE PARTS • TIG TORCHES • WELDING ACCESSORIES •...

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