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UNIMIG Cat 2017 low res

TECHNICAL NOTES TIG DC

TECHNICAL NOTES TIG DC TIG Welding 70% 30% The DC power source uses what is known as DC (direct current) in which the main electrical component known as electrons flow in only one direction from the negative pole (terminal) to the positive pole (terminal). In the DC electrical circuit there is an electrical principle at work which should always be taken into account when using any DC circuit. With a DC circuit 70% of the energy (heat) is always on the positive side. This needs to be understood because it determines what terminal the TIG torch will be connected to (this rule applies to all the other forms of DC welding as well ). power source argon gas nozzle DC TIG welding is a process in which an arc is struck between a TUNGSTEN electrode and the metal work piece. The weld area is shielded by an inert gas flow to prevent contamination of the tungsten, molten pool and weld area. When the TIG arc is struck the inert gas is ionized and superheated changing it’s molecular structure which converts it into a plasma stream. This plasma stream flowing between the tungsten and the work piece is the TIG arc and can be as hot as 19,000°C. It is a very pure and concentrated arc which provides the controlled melting of most metals into a weld pool. TIG welding offers the user the greatest amount of flexibility to weld the widest range of material and thickness and types. DC TIG welding is also the cleanest weld with no sparks or spatter. low current The intensity of the arc is proportional to the current that flows from the tungsten. The welder regulates the welding current to adjust the power of the arc. Typically thin material requires a less powerful arc with less heat to melt the material so less current (amps) is required, thicker material requires a more powerful arc with more heat so more current (amps) are necessary to melt the material. high current LIFT ARC IGNITION for TIG (tungsten inert gas) Welding Lift Arc is a form of arc ignition where the machines has low voltage on the electrode to only a few volts, with a current limit of one or two amps (well below the limit that causes metal to transfer and contamination of the weld or electrode). When the machine detects that the tungsten has left the surface and a spark is present, it immediately (within microseconds) increases power, converting the spark to a full arc. It is a simple, safe lower cost alternative arc ignition process to HF (high frequency) and a superior arc start process to scratch start. gas flow tungsten off the work tungsten touches the work arc ignition established TIG arc Lay the nozzle on the job without the tungsten touching the work Rock the torch sideways so that the tungsten touches the work & hold momentarily Rock the torch back in the opposite direction, the arc will ignite as the tungsten lifts off the work Lift the torch to maintain the arc 292

TECHNICAL NOTES TIG DC Pulse TIG Welding General Description Pulse TIG welding is when the current output (amperage) changes between high and low current. Electronics within the welding machine create the pulse cycle. Welding is done during the high-amperage interval (this high amperage is referred to as peak current). During the low amperage period, the arc is maintained but the current output of the arc is reduced (this low amperage is referred to as base current). During pulse welding the weld pool cools during the low amperage period. This allows a lower overall heat input into the base metal. It allows for controlled heating and cooling periods during welding providing better control of heat input, weld penetration, operator control and weld appearance. There are 4 variables within the pulse cycle: Peak Current - Base Current - Pulse Frequency - Pulse Width Setting and manipulation of these variables will determine the nature of the weld current output and is at the discretion of the operator. Peak Current is the main welding current (amps) set to melt the material being welded and works much the same as setting maximum amperage values for regular DC TIG: as a guide use 30-40 amps for every 1mm of material thickness. Base Current is the set level of background current (amps) which cools the weld puddle and affects overall heat input. Background Amps is a percentage of peak amperage. As a rule, use enough background current to reduce the weld pool to about half its normal size while still keeping the weld pool fluid. As a guide start by setting the background amperage at 20 to 30 percent of peak amperage. Pulse Frequency is the control of the amount of times per second (Hz) that the welding current switches from Peak Current to Base Current. DC Pulse TIG frequency generally ranges from 20 to 300 HZ depending on the job application. Control of the pulse frequency also determines the appearance of the weld. Pulse Width is the control of the percentage of time during one pulsing cycle the power source spends at the peak current (main amperage). Example is with the Pulse Width set at 80 percent and a rate of 1 pulse per second (PPS), the machine will spend 80% of the pulse at peak amperage and 20% at the base current. Increasing the pulse width percentage adds more heat to the job, while decreasing pulse width percentage reduces heat Current peak background ON OFF Time DC Pulse Tig welding allows faster welding speeds with better control of the heat input to the job, reducing the heat input minimising distortion and warping of the work and is of particular advantage in the welding of thin stainless steel and carbon steel applications. The high pulse frequency capability of the advanced inverter agitates the weld puddle and allows you to move quickly without transferring too much heat to the surrounding metal. Pulsing also constricts and focuses the arc thus increasing arc stability, penetration and travel speeds. high frequency pulsing no pulse high frequency pulsing no pulse 293

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    WELDING GUNS OF AUSTRALIA PTY LTD W

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    ORDERS AND ENQUIRIES Welding Guns O

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    MMA/TIG DC INVERTER WELDERS Page UN

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    MIG - TIG - MMA DC INVERTER WELDERS

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    INDUSTRIAL MIG TRANSFORMER WELDERS

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    AC/DC TIG/MMA INVERTER WELDERS Page

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    SPOT WELDING MACHINES Page TECNA 70

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    UNIMIG VIPER ARC 140 MMA/TIG - 140

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    UNIMIG VIPER ARC 160 MMA/TIG - 160

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    RAZORWELD ARC 140 MMA/TIG - 140 Amp

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    RAZORWELD ARC 180 MMA/TIG - 180 Amp

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    RAZORWELD ARC 160 MMA/TIG - 160 Amp

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    RAZORWELD ARC 200 MMA/TIG - 200 Amp

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    ARC 400 TIG/MMA - 400 Amp DC Invert

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    VIPER 182 MIG/MMA 182 Amp MIG Welde

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    RAZOR MIG 175 MIG/MMA - 175 Amp DC

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    RAZOR MIG 200 MIG/MMA - 200 Amp DC

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    RAZOR MIG 205 SMART SET MIG/TIG/MMA

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    RAZOR 250 MTS MIG/TIG/MMA - 250 Amp

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    RAZOR DIGITAL 250 MIG/TIG/MMA - 250

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    RAZOR MIG 250 SWF MIG/TIG/MMA - 250

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    WORKSHOP 270 Compact / 270SWF Torch

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    WORKSHOP 345 Compact / 345SWF Torch

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    WORKSHOP 390 Compact / 390SWF Torch

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    DC PULSE MIG WELDER 206 Multi Funct

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    MULTI 250KT - PLUS CONCEPT DC Multi

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    RAZOR DIGITAL 200 AC/DC TIG/MMA - D

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    UNIMIG TIG 315 AC/DC Square Wave, P

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    AC/DC MULTIWAVE INVERTER WELDER DIG

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    SITECUT 10 Plasma - 25Amp Inverter

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    VIPERCUT 40 PLASMA Plasma - 40 Amp

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    RAZOR CUT 45 Plasma - 45 Amp Invert

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    RAZOR CUT 80 Plasma - 80 Amp Invert

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    P-TRONIC 100 Plasma - 100 Amp Plasm

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    MACHINE OPTIONS Accessories UMJRTRO

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    ENGINE DRIVEN GENERATOR WELDER Raz

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    RWS WIRE FEEDING UNIT Pulse MIG / D

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    AUTOMATIC WELDERS HIT-8SS AUTOMATIC

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    SPOT WELDERS Accessories for Models

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    SUSPENDED GUNS Items 3321-3328 - 16

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    Foot operated spot welders Items 46

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    Pneumatic spot welders - Items 4645

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    FUME EXTRACTION EQUIPMENT Mobile Si

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    INDUSTRIAL GAS EQUIPMENT UNI-FLAME

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    INDUSTRIAL GAS EQUIPMENT Cutting Eq

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    INDUSTRIAL GAS EQUIPMENT SG-30 Pipe

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    PROTECTIVE SAFETY WEAR Welding Jack

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    STARTER KITS UNIMIG Apprentice Bag

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    ARC ACCESSORIES Electrode Holders,

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    ARC ACCESSORIES Cable Lugs, Chippin

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    3 Years Warranty MIG ACCESSORIES Al

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    MIG WELDING TORCHES Suregrip Series

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    Suregrip Series SB15 MIG TORCH Fron

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    AUTOGEN RITTER PPL 260/360 MIG TORC

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    Suregrip Series DM24 DIGITAL MIG TO

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    SPG135 AMP SPOOL GUN Duty Cycle 30%

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    SPG200II AMP SPOOL GUN Front end co

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    Suregrip Series BND 300 MIG TORCH F

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    TIG WELDING TORCHES Suregrip Series

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    Suregrip Series 9V ERGO TIG TORCH S

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    Suregrip Series 17V TIG TORCH Stand

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    Suregrip Series 26V TIG TORCH Stand

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    TIG WELDING TORCHES Suregrip Series

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    Suregrip Series SR9 ERGO TIG TORCH

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    Suregrip Series SR17 ERGO TIG TORCH

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    Suregrip Series SR26 ERGO TIG TORCH

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    Suregrip Series SR18 ERGO TIG TORCH

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    WELDING CONSUMABLE RED NECK TIG KIT

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    PLASMA CUTTING TORCHES PT25C S25 Pl

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    PLASMA CUTTING TORCHES TD35 SC80 Pl

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    PLASMA CUTTING TORCHES TD35 CBR150

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    PLASMA CUTTING TORCHES PTM-100 Plas

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    PLASMA CUTTING TORCHES TD35 PCH/M25

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