Over 400 Used Machines in Stock in Leicester Fast Worldwide Despatch in 2-14 Days Minimum 4 Months Warranty Included Qualified Engineers for Support & Trainingthe page you are looking for is no longer available! Westermans International is a supplier of New and Used Welding Equipment, Gas and Plasma Cutting Machines and Positioning equipment for the heavy metal fabrication industry around the world. We have supplied welding machines since 1967 and are proud to have the largest selection of Used Welding & Cutting equipment in Europe. Invest in our refurbished equipment and we Guarantee you will receive expert knowledge and advice, personal after-sales Support for the life of your Welding Machine. Welding Equipment in Stock Gallery of Sold Welding Machines Register for Stock Updates and Special Offers Or Call NOW for Prices and Further Details +44 (0)116 2696941 New Hypertherm Powermax 45XP Plasma Cutting ... A&N Plant Elevating Welding Positioner,

Bode 150 VP HR Hydraulic Elevating Welding ... to receive your Discount Code, Latest Stock & Special Offers Welding Helmets just for Women26 September 2016 | 0 Comment »Extraction in the Workplace – The Industry Hot Topic!20 September 2016 | 0 Comment »Gullco for Welding Automation12 September 2016 | TIG Welding (GTAW) is a process that uses the a non-consumable tungsten electrode to produce a weld with or without a filler material. The equipment is significantly different than MIG equipment and somewhat different than what is used for stick welding. That said, a welding machine with the right accessories can be fitted for TIG welding.Basic TIG equipment components include:tungsten electrodewelding machine (constant current-CC, AC, DC+, DC- or AC/DC). There are advantages to getting a machine that is designed for TIG welding in order to stay balanced during the weld (see below for explanation). Regardless of type, a high frequency unit must be built in or attached.torch or electrode holdershielding gas supply (helium, argon or mixture): argon better for thinner metals due to lower heat requirementfiller metal rodpersonal safety equipmentMost welding is done with DCSP or AC current.

While the equipment is more expensive, there are many advantages to the TIG process. On important disadvantage is that GTAW is less economical than consumable electrode processes for sections thicker than 3/8 of an inch. For TIG equipment specifications, download the document from the resources section at the bottom of this page. The basic features of the TIG equipment are shown in figure 10-33. The major components required for TIG welding are: Diagram of TIG Welding Equipment Figure 10-32: TIG Gas Tungsten Welding (GTAW) Equipment Arrangement There are ac and dc power units with built-in high frequency generators designed specifically for TIG welding. These automatically control gas and water flow when welding begins and ends. If the electrode holder (torch) is water-cooled, a supply of cooling water is necessary. Electrode holders are made so that electrodes and gas nozzles can readily be changed. Mechanized TIG equipment may include devices for checking

and adjusting the welding torch level, equipment for work handling, provisions for initiating the arc and controlling gas and water flow, and filler metal feed mechanisms. When welding using GTAW (TIG), the amount of heat energy created depends on arc polarity, arc voltage and amperage. how to charge an ac unit with r22Polarity describes direction of the current flow in DC welding. mini split ac units tampaThere are two ways the welding current can flow, DCSP and DCRP.car air conditioning repair venturaDCSP WeldingDirect current flowing from the electrode (–) to the workpiece (+) is direct current straight polarity, or DCSP.   Most TIG welding is done with AC or DCSP current.DCRP WeldingCurrent which flows from the workpiece (–) to the electrode (+) is direct current reverse polarity, or DCRP.

AC welding machines will either be unbalanced or balanced.In AC machines, the current, in theory, flows in DCRP half of the time and DCSP half of the time.When the current flows in the DCRP half of the cycle, the current is flowing from the workpiece to the electrode, causing a high resistance to current flow. This resistance, which is caused by the current that flows from the base metal (a large conductor), moves to a concentrated point in the tungsten electrode, which results in it heating up.When in the DCSP half of the cycle, the current is flowing from the electrode tip, a small conductor, to the workpiece, a large conductor. This direction of current flow has a cooling effect on the tungsten and enhances its current-carrying capacity.The sinewave becomes "unbalance" when the AC machine doesn't compensate for the higher resistance in the DCRP part of the cycle. One-half of the time the voltage is higher than expected (DCSP), and one-half of the time the voltage is lower than expected (DCRP).  

AC machines without the required circuitry to have sinewave balance should not have the amperage set at higher than 50% of rated capacity. If it is set higher, then the machine could be damaged.The advantage of getting an AC TIG equipment that has been designed for TIG welding is that the sinewave is balanced. When designed for TIG welding, there is a circuit built in that compensates for the part of the cycle that is DCRP, keeping the sinewaves equal or in balance.HF (High Frequency) TIG welding units are Always RequiredWhether AC or DC is used for TIG welding, a high frequency (HF) unit must be built into the machine, or a portable one must be attached to it.The high frequency unit produces high frequency voltage (several thousand volts) at a frequency of several million cycles per second.The current in the high frequency circuit is only a fraction of an ampere.Because of the high voltage and frequency, the current is carried on the surface of the conductor rather than penetrating throughout the conductor.

When TIG welding with DC current, the high frequency unit must be on in order to start the arc. Once the arc is stabilized, the high frequency unit is turned off.On DC machines using an add-on portable high frequency unit, the high frequency circuit will need to be turned off manually.On AC machines TIG welders with high frequency units are used to stabilize the arc and to ionize gases in the arc zone. The ionized gases make the arc easier to maintain when the current changes directions. TIG welding torches have a duty-cycle rating as electrical devices. Duty-cycle refers to the max. current the torch can withstand in 10 minutes. Other types of TIG equipment torches such as smaller light-duty torches are air-cooled and usually have only one hose connected to them, which is a combination electrode lead andThe electrode lead may be either a woven tube or a flexible cable, and the shielding gas acts to cool the electrode lead as it flows to the torch.

TIG welding electrodes come in the following variations:TIG welding tungsten electrodes also vary by finish:Other TIG equipment electrode selection criteria:Before being used for TIG welding, electrodes must be sized and shaped. Some TIG welding jobs call for an electrode with a specific shape, which are used for critical welds.Electrodes which are contaminated or those which are too long to fit into the electrode cap must be shortened.The desired shape of an electrode after it is properly broken is a square, blunt edge. Electrodes may be broken with pliers, wire cutters, or a hammer. The electrode end must be correctly shaped after it has been broken.Most TIG welds need an electrode with a sharp point along with DCSP current. For AC (alternating current) a rounded (balled) electrode end is required.To control any shielding gas, a flowmeter is used and calibrated in liters per minute (L/min.) or cu. ft. per hour (cfh) or both. For accurate readings, the flowmeter must be installed in a vertical position.