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Aluminum Alloy castings scrapped in the foundry since of surface defects and lack of dimensional integrity can be recovered by welding apart from if they present massive porosity.

Gas tungsten arc welding (GTAW) with high frequency stabilized Alternating Current is usually used to fix sound castings. Inclusions are supposed to be disallowed by taking care to avoid touching the surface with the pure tungsten electrode.

Argon with or without helium can be used as a shield. Helium helps produce a hotter arc if essential. To arrange for welding one should remove defects, particularly cracks, by dry chipping with a rounded tool or by hand milling, to get a smooth area. One ought to by no means attempt to weld on the original casting outside rough surface with no first removing the oxidized coating.

Removal of oil and grease is performed using steam degreasing or clean solvents. Use of acid etch is not suggested. If impregnation was applied, it should be removed previous to welding. A spotless stainless steel wire brush should be used to clean thick oxide layers just earlier than welding.

Filler material alloy is regularly the same as that of the casting. Preheating is wanted only in outstanding cases to conquer difficulties.

On correctly prepared surfaces of sound castings, with oxide coatings thoroughly cleaned, one should be able to weld as with no trouble as on wrought alloys. It would be fine practice to look for cracks in the weld by using penetrant inspection.
Radiographic check may be necessary by contract in sure cases.

If the original castings are to be warmth treated, also the fixed ones should go after the same procedure. Weld repairing of heat treated casting would impair their mechanical properties.

The possibility of repair of aluminum alloy castings that were previously heat treated and machined is doubtful since of stresses and deformations likely to develop during welding.

Welders:Plasma Cutter:Arc welder:Mig Welder:Tig Welder:Diesel Generator:Cutting Machines

There are a little things regarding plasma cutter safety that are different from common welding safety tips. This small list of plasma cutter safety tips is geared toward light duty plasma cutting using compressed air not large manufacturing units that use gas mixtures and water cutting tables.

Electric Shock Can Kill:

– Operating a plasma cutter completes an electric circuit between the torch and the workpiece. The workpiece and something touching the workpiece are part of the electrical circuit.

– Never touch the torch body, workpiece or the water in a water table when the plasma system is working.

Voltages & Currents:

– Plasma cutter output voltages are large amount greater than welding voltages, usually 100-200 volts.

Precautionary Measures:

– Don’t pick up the workpiece, including the waste cutoff, as you cut. Leave the workpiece in place on the workbench with the work wire attached during the cutting process.

– During plasma cutting processes don’t move the work clamp.

– Wear insulated gloves and boots, and keep your body and clothing dry.

– Don’t stand, sit or lie on or if not touch any wet surface when using the plasma cutter system.

– Insulate yourself from work and ground using dry insulating mats or covers large sufficient to prevent any physical contact with the work or ground. If you must work in or near a damp area, use great caution.

Welders:Plasma Cutter:Arc welder:Mig Welder:Tig Welder:Diesel Generator:Cutting Machines

Tig Welding Dvd

TIG Welding

Tungsten inert gas (TIG) welding, is a high quality welding process that has become a popular choice of welders. It is used when high quality, precision welding is required. In TIG welding a variety of weld types can be performed on several different metals. Steel and aluminum are the two most widely used metals in TIG welding .

An arc is formed between a non consumable tungsten electrode and the metal being welded in TIG welding. A clean weld is formed as a result of the gas shield and this prevents oxidization from occurring. In TIG welding, gas is fed through the torch to shield the electrode and molten weld pool and filler wire is added to the weld pool separately.

In TIG welding reactive metals such as magnesium and aluminum are blended together. This welding method became popular and useful in the early 1940s. As a result, this has greatly propelled the use of aluminum for welding and structural processes. TIG welding is commonly used for both high quality and manual welding.

Gas shielding typically used for TIG welding includes argon, helium, or a combination of both. These two gases when combined ensure a higher welding speed and welding penetration. In TIG welding Argon is preferred by most welders as is heavier than air and provides better coverage when welding.

Different types of joints are used in TIG welding and these include the butt joint, lap joint, corner joint and t-joint. The butt joint can be welded without the assistance of a filler rod. With this type of joint, two pieces of metal are joined together along the seams.

There are several benefits of TIG Welding which include: Superior quality welds Welds can be made with or without filler metal Precise control of welding variables (heat) Free of spatter Low distortion

As UK’s premier choice for welding supplies, Foster Industrial aims to provide its customers Professional and Quality Service at all times. With our wide range of welding supplies that include Mig Welder, Tig Welder, Plasma Cutter or just welding Spares and Accessories. Our reputation is built on top level service with quality products at a fair price. If you are interested in any welding & fabrication items, or would like more information, call at either: Nottingham 0115 970 0598 or Leicester 0116 262 1386.

Alternatively, send an email: sales@fosterindustrial.co.uk

About Author: Foster Industrial is one of the UK’s leading Industrial suppliers stocking items from welding supplies to plasma cutters, safety wear to abrasives.

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Ron Covell Announces New Advanced TIG DVD at SEMA 2009

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Plasma cutters produce the plasma in one of two ways: High-Frequency (HF) Contact or Pilot Arcs. Which one your plasma cutter uses depends on how old it is; the new high tech equipments use pilot arcs. The major dissimilarity is that HF Contact models have to close a circuit with a work piece that conducts electrical energy in order to cut while the pilot arc models can cut anything. They work in very different ways.

HF contact method of generating plasma is still found in low financial plan plasma cutters and in older plasma cutters. How it works is the plasma cutting component is connected to the work piece by a clamp and wire and when you touch the nozzle of the torch to the work piece an electric circuit is created. An electric arc zips from the work piece threw the plasma torch nozzle to the negative electrode inside the torch head. At the same time, pressurized inert gas runs in the opposite way, from the torch head out onto the work piece. As the gas surges past the zapping electric arc it is heated to around 50,000 degrees Celsius. At that heat the gas becomes plasma which is a form of matter that is a liquid and a gas at the same time. It is this super hot, super fast moving plasma that cuts the metal. The HF contact technique is said to contain one cycle since the major plasma flow is created in one step.

The Pilot Arc technique is a two cycle procedure. First, a high power, low amperage circuit is used to make a small, high intensity flash in the body of the torch which creates a small pocket of plasma in the torch head (note that the plasma is previously produced in the torch without the required to touch the work piece, this is what eliminates the require for a conducting work piece). Now, you can use a trigger to ignite the main plasma arc that will be used for cutting whatever it is you desire to cut. Pilot Arc is the technique used in CNC plasma cutting applications.

Welders:Plasma Cutter:Arc welder:Mig Welder:Tig Welder:Diesel Generator:Cutting Machines