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Summary of Contents for Taurus MIG-250TD
- Page 1 Inverter Gas Metal Arc Welding Machine MODELS MIG-250TD & MIG-300TD Operation Manual Read this manual carefully before installing, operating and maintaining the machine.
- Page 2 Description: This machine is designed and built to weld ferrous and non-ferrous metals. Disclaimer: The information, illustrations and instructions described in this manual are based on the latest product information available at the time of publication. The manufacturer and distributors reserve the right to modify the contents of the owner’s manual at any time.
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Page 3: Table Of Contents
CONTENTS Safety Precautions ................3 Warnings ..................4 Packaging and Transportation ..............7 Parameter ....................8 Product Description ................8 Working Principle .................. 13 Installation and Wiring ................13 Brief Procedure for Welding Operation ..........19 Maintenance ..................25 Common Machine Malfunctions and Solutions ........26 - 2 -... -
Page 4: Safety Precautions
Safety Precautions The equipment is designed for use by qualified personnel who have completed professional training and have obtained a qualification certificate as a welder. The operator shall have sufficient professional knowledge of welding, cutting and circuitry. The machine should be operated only after having read and fully understood all the safety precautions and warnings contained in this manual and those generally applicable to welding operations. -
Page 5: Warnings
Warnings Welding and cutting operations are specialised operations which present a certain degree of risk. Professional training, correct operating procedures and protective measures reduce the accident risk and damage to equipment. Personal Safety Protection Welding and cutting operations generate noise, bright light and high-temperature sparks which will cause harm to human hearing, eyes and skin unless personal protective measures are implemented and proper operational instructions are adhered to. - Page 6 Welding and cutting on sealed gas tanks will cause explosions. These operations are prohibited. Welding and cutting areas must be provided with adequate fire extinguishing equipment. Regular testing for efficiency of this equipment is compulsory as is training of staff in the use of the equipment. Once the welding/cutting operation is completed, check for any high temperature spark or metal which might cause a fire and immediately dispose of it.
- Page 7 health. However, it would be wise to limit exposure to EMF as far as possible and the following procedures are suggested: Welders and cutters with cardiac pacemaker implants should obtain medical advice on the effects of EMF on the implant. Welders should minimise the possibility of electromagnetic field damage through the following methods.
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Page 8: Packaging And Transportation
Gas cylinders should be kept away from extreme temperatures and fire sources. Scratching on cylinder walls with hard objects should be avoided. A flowmeter should be installed on the gas cylinder in use in accordance with the manufacturer's operating instructions. Quick-coupling connectors must not be used and gas hose fittings should be tested for leaks. -
Page 9: Parameter
Parameters MIG-250TD MIG-300TD Model Parameters Item 1PH--AC220V±15% 3PH--AC380V±15% Rated input voltage: 50/60Hz 50/60Hz 10.5kVA 14.0kVA Rated input power: 25.0A Rated input current: Rated duty cycle: 50-250 50-300 Output current range(A): Open circuit voltage: ≥85% Efficiency: Φ0.8-Φ1.2(mm) Wire diameter: 2～24(L/min) Gas flow-rate:... - Page 10 machine has good dynamic characteristics, and offers a stable arc, good welding quality and ease of control. This semi-automatic, high-performance machine is designed for CO₂ and mixed-gas welding on low-carbon steel, low-alloy steel, stainless steel, galvanized sheet and copper. Steel and stainless steel wire as well as other solid wires with diameter Φ0.8 - Φ1.2mm can be used.
- Page 11 2. Appearance Diagram: MIG-350I/500I Panel： Control Panel Euro Standard Torch Connector: Connects the welding torch. Polarity conversion plug：When using flux-cored wires the coupling device is connected to the negative pole. - 10 -...
- Page 12 Terminal sockets - positive pole (+) and negative pole (-): In MMA mode the electrode holder cable is connected to the positive terminal and the earth cable is connected to the negative terminal and should be reversed when using scratch start DC TIG in MMA mode. In MIG mode the polarity cable is connected to the positive terminal and the earth cable is connected to the negative terminal for all MIG welding applications, except for gasless flux-core welding where the polarity...
- Page 13 0~t1: Press torch trigger. Gas pre-flow starts. t1~t2: Wire feed starts. Gas flows. t2: Welding operation starts and current reaches preset value. t3~t4: Trigger released. Wire feeding stops and current drops to zero. Post-flow gas will continue for a short period. Note: the gas pre-flow and post-flow not adjustable in T2 mode.
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Page 14: Working Principle
Working Principle Diagram Explaining Working Principle 1.1. A bridge rectifier converts AC to DC; 1.2. After secondary rectification and reactor filtering, output welding current is delivered that meets the welding requirements; 1.3. Controlled by PWM the IGBT inverts the DC to 20KHz AC which is transmitted via a high-frequency transformer;... - Page 15 2. Power Input Requirements The power supply waveform should be the standard sin wave, the rated voltage 380V±10% 50/60Hz. Three phase voltage unbalance should be ≤ 5 Model MIG-250TD MIG-300TD Parameters Value 1PH-AC220V ±15% 3PH-AC380V±15% Power supply： 50/60Hz 50/60Hz Rated input current: 25.0A...
- Page 16 Wiring of single phase AC, 50/60Hz welding machine Item Item Power cord Overcurrent protection device Live wire L Neutral wire N Earth wire terminal block Earth wire Electric control box Terminal block Wiring of three phase AC, 50/60Hz welding machine - 15 -...
- Page 17 Item Item Power cord Terminal block Live wire L1 Overcurrent protection device Live wire L2 Live wire L3 Earth wire terminal block Earth wire Electric control box 4. Gas-cylinder Connection Prevent gas Explosion hazard Wear goggles inhalation Warning: The following safety instructions are important when connecting a gas cylinder to the welding machine.
- Page 18 5. Wire Feeder 5.1. Composition Item Item Tensioner roller Pressure regulating handle Drive roll 5.2. Selection of Tensioner Roller and Drive Roll Non-groove Non-groove Tensioner roller Drive roll V groove knurled Suited for hard wires such as carbon steel and V groove roll stainless steel wire.
- Page 19 Scale Table Diameter Ø0.8mm Ø1.0mm Ø1.2mm Pressure Drive roll V groove roll Pressure scale Knurled roll The actual pressure scale to be used will be determined by the length of the torch cable, the type of welding torch and welding wire as well as wire-feeding conditions.
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Page 20: Brief Procedure For Welding Operation
7. Installation and Adjustment of Welding Wire Prevent injuries Prevent injuries caused Wear goggles caused by wire by moving parts ！Attention: ◆ The wire speed generated by the feeder is relatively fast and safety during the installation and adjustment process is of prime importance. Never point the welding torch nozzle to a face or other body part. - Page 21 1.9. Connect the MIG torch to the Euro socket adaptor on the wire feeder and tighten the connection nut. 1.10. Switch on the machine and ensure the indicator light is lit and the fan is operational. Open the gas valve on the cylinder and regulate the gas flow to the required flow-rate.
- Page 22 2. Schematic Diagram for the MIG Welding Process When self-shielded welding wire is used, connector 8 must be connected to the negative pole of the coupling device and the earth clamp cable end to the positive pole of the coupling device. Attention: When self-shielded flux-cored wire is used in gasless self-shielded welding mode, a knurled wire feeder is required.
- Page 23 3.3. Confirm that the insulation layers on all the wires and cables of the welding machine are intact and that the cable set is secure and correctly connected to the machine. 3.4. Confirm the machine is freely vented and that the vents on the machine are not obstructed and no objects are lying on the machine body.
- Page 24 Direct Current Electrode Negative (DCEN): Suitable for acid electrode welding(as shown in the figure above). Direct Current Electrode Positive (DCEP): Suitable for alkaline and cellulose electrode welding. Item Item Welding machine Earth clamp Electrode holder Work piece 5. Suggested Settings for MMA Welding Electrode diameter Welding current range Welding Voltage range...
- Page 25 Free Plate Wire Wire Amperage Voltage wire thickness diameter speed flow length （ mm ） （ mm ） (cm/min) (L/min) （ mm ） 0.8 、 0.9 60~80 16~17 40~50 0.8 、 0.9 80~100 19~20 40~55 10~15 1.0 、 1.2 120~160 20~22 35~45 10~15...
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Page 26: Maintenance
7.1. Blackened Welding Spots This phenomenon indicates that the welding spot is oxidised owing to insufficient protection. The following remedial actions can be pursued: 7.1.1. Check the efficiency of gas flow and pressure. As a general rule the pressure in the cylinder should be above 0.5 mPa. If not, exchange or refill the cylinder. -
Page 27: Common Machine Malfunctions And Solutions
1. Daily Precautionary Checks 1.1. For any abnormal vibrations, sounds or odours. 1.2. For any sign of overheating on cable connections. 1.3. Whether the power switch is operational and the fan operates smoothly when the machine is switched on. 1.4. Whether cables are correctly connected, insulated and in sound order. 1.5. - Page 28 1. Inspection Before Overhaul 1.1. Check if the line voltage on the three-phase power supply is within the range of 340V-420V and, all phases are intact. In case of a single-phase supply, check if the line voltage is within the range of 200V – 240V 1.2.
- Page 29 Error indicator Overheated power supply Improve ventilation light is lit, fan owing to insufficient condition operational ventilation. and digital Ambient temperature too Wait 5-10 minutes with no meter in good high. welding to allow recovery. order. No Wait 5-10 minutes with no no-load Duty cycle exceeded.
- Page 30 3. Common Welding Imperfections and Analysis Imperfect Root cause 1. Impure gas or insufficient gas supply. 2. Absorption of air during welding. 3. Failed preheater. 4. Poor gas shielding owing to strong wind. 5. Torch nozzle blocked by spatter. 6. Too great a distance between nozzle and workpiece.
- Page 31 Imperfect Root cause 1. Loose or worn contact tip or too large in diameter for the wire thickness. 2. Uneven wire spool rotation: excessive wear on the groove of the drive roll and the pressure from the tensioner roller not adequate. Unstable 3.
- Page 32 4. Circuit Diagram - 31 -...
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