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Summary of Contents for Taurus MIG-350L PRO
- Page 1 Inverter Gas Metal Arc Welding Machine MODELS MIG-350L PRO & MIG-500L PRO 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 this 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 .................. 14 Installation and Wiring ................14 Brief Procedure for Welding Operation ..........18 Maintenance ..................22 Common Machine Malfunctions and Solutions ........23 - 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 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 Model MIG-350L PRO MIG-500L PRO Item Value 3PH-AC150V~550V 3PH-AC380V/525V Rated input voltage: 50/60Hz 50/60Hz Rated input power: 15.7KVA 25.5KVA Rated input current: 38.5A Output current range: 30A~350A 40A~500A Open circuit voltage: Rated duty cycle: Wire diameter(mm): Φ0.8-Φ1.2 Φ1.0-Φ1.6 IP grade... - Page 10 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 - Φ1.6mm can be used. The inverter welding machines in this series are manufactured in accordance with IEC60974-1 <Arc Welding Equipment - Part 1: Welding Power Sources >, Safety Requirements for Arc Welding Equipment.
- Page 11 2. Appearance Diagram: Panel： Wire feeder Control panel - 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 cable is reversed...
- Page 13 operates under this mode when the corresponding light is lit. Inching wire feed selection: Pressing the button will start the wire feed. Releasing the button will stop the wire feed. Welding mode selection: Pressing the button selects between MIG/ MAG and MMA modes and the selection is indicated by the corresponding light.
- Page 14 3.2. 4T Mode The setting applies for longer-spell welds and the responding current curve is depicted below. 0~t1: Press torch trigger. Gas pre-flow starts. t1~t2: Release the trigger and the wire feed starts and current reaches preset value. t2~t3：Pressing the trigger again, stops the wire feeding and drops the current to zero.
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Page 15: Working Principle
t4/t5: If the trigger is released after the preset welding time, the operation will come to a stop when the preset welding time has lapsed and the current has dropped to zero. Gas feed will continue for a short period of time (post-low). Working Principle Diagram Explaining Working Principle 1.1. - Page 16 10cm at each side. 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-350L PRO MIG-500L PRO Parameters Value Input cable： ≥6.0mm ≥10.0mm...
- Page 17 3.6. The connection screws on the terminal block must be tight ensuring a solid connection between the machine cable wires and the main power supply. 3.7. The correct wiring procedure is explained in the following diagram: Wiring of three phase AC, 50/60Hz welding machine Item Item Power cord...
- Page 18 4.3. Connect the gas hose firmly from the flowmeter outlet to the gas inlet situated at the back of the welding machine. Gas leakage is not allowed. 4.4. Adjust the flowrate in accordance with the manufacturer's recommendation. Generally, 15 -20 litres/min. 5.
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Page 19: Brief Procedure For Welding Operation
However: ！ ◆ Take care not to apply excessive pressure which will result in wire being deformed and coatings being damaged. ◆ Excessive pressure will also result in faster drive-roll wear. 6. Installation of Wire Liner and MIG Torch In order to deliver a smooth and successful welding job, it is important to confirm that the wire liner and contact tip is compatible with the welding torch and that the wire liner is suitable for the diameter and type of wire to be used. - Page 20 1.4. 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. 1.5. Connect and tighten the earth cable to the negative pole. Clamp the other end of the cable to the workpiece.
- Page 21 2. Procedure for MMA Welding 2.1. Wear the necessary welding protection equipment such as helmet, mask, earplug, protective clothing, gloves, insulating safety shoes. 2.2. Confirm the electrical grid connected to the welding machine is consistent with the correct power supply of the machine. 2.3.
- Page 22 4. Suggested Settings for MMA Welding Electrode diameter Welding current range Welding Voltage range （mm） （A） （V） Φ2.5 50~90 22.0~23.6 Φ3.2 90~130 23.6~24.2 Φ4.0 140~210 24.4~25.2 Φ5.0 200~260 26.4~28.4 Φ6.0 260~300 28.0~30.8 5. Possible Welding Deficiencies The following deficiencies are related to situations outside the electronic circuits and are mostly attributed to accessories, gas and power supply and external circumstances.
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Page 23: Maintenance
5.2.3. Extended welding cables can cause excessive voltage drop at the torch end resulting in arc problems. 5.3. The Output Current is Below the Rated Value Power supply which deviates from the rated voltage, will have a consequential effect on the output current. Under-power input will result in under-power output. Maintenance Safe operation of the machine is dependent on regular maintenance and the replacement of worn and defective parts where necessary. -
Page 24: Common Machine Malfunctions And Solutions
Common Machine Malfunctions and Solutions Warning：Machine maintenance and repair must be carried out by qualified technicians. The operating voltage in the machine can be up to 600V and it is important that power be cut at the machine and at the control box before covers are removed and repairs carried out. - Page 25 Problem Root Cause What to do Replace wire feeder Control cable of wire feeder or control cable or the the controller is broken. controller. Welding current Machine control board Replace the control cannot be damaged. board. adjusted. The wire at both ends of the Reconnect the broken diverter insider the welder is wire.
- Page 26 Problem Root Cause What to do When torch Torch trigger damaged. Replace the torch. trigger is Repair the wire Broken wire feeding control. pressed and feeding control cable. held, wire feeder fails and there is no Replace the control Damaged control circuit board. indication of circuit board.
- Page 27 Imperfect Root Cause 1. Low welding current and uneven wire-feed speed. 2. Arc voltage too low or too high. 3. Inside the beveled edge the welding speed is too Incomplete slow or too fast. penetration 4. Beveled gap too small. Welding wire out of position and not aligned with the centre of the welding bead.
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