Archive for January, 2010

Tig Welding Overview

Friday, January 29th, 2010

Tungsten insert gas welding is popularly also known as Gas tungsten arc welding (GTAW). You can protect the welding area from getting contaminated with the help of shielding gas which is insert gas.

Tig welding is more widely used to weld the thin sections of stainless steel and non ferrous metals such as aluminum magnesium and copper alloys. This welding process grants the operator to have a greater control over the weld when compared with other welding procedures such as shielded metal arc welding and gas metal arc welding. Though this welding process is very slow but it provides high quality welds.

Tig welding can be carried on all positions - flat, horizontal, vertical or overhead. Perfect for roll cages and inside confined areas too. Filler rod is one of the most important aspects in this welding process.

Equipments required for tungsten insert gas welding process are welding torch utilizing a non consumable tungsten electrode, a constant-current welding power supply, and a shielding gas source.

During this welding process an arc is formed between a non-consumable tungsten electrode and the metal being welded. Gas is fed through the torch to shield the electrode and molten weld pool. If filler wire is used, it is added to the weld pool separately. Welders have to be careful while doing this procedure.

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WELDING OVERVIEW

Thursday, January 28th, 2010

In the recent years, welding has gone through drastic changes in electric arc, laser beam, gas flame or electron beam welding. Latest developments are going on in robot welding. Welding is one of the important tools in construction, manufacturing or garage shop. The person who does this job has to take lots of safety steps and follow them wisely and if he fails to do so it can be very hazardous for him and others too.

Today different methods and techniques are carried on in welding process. Most of the equipment that we use in our day to day life or which we come in contact often is mostly welded in some way or either. Welding is a technique to join two or more pieces to make them look into one single piece. Welding process has to be carefully carried on because chances of mishaps are frequent due to carelessness or lack of knowledge in equipment handling or usage or misuse of available equipments. While welding, protect your eyes with the help of goggles and helmets. To protect other parts of your body, wear flame proof coats and gloves.

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To weld Titanium

Wednesday, January 27th, 2010

The process of Welding-titanium and its alloys must be carried with lots of safety measures because these materials are very reactive to contamination from atmosphere gases. The process of welding this material is quite different from other ferrous materials.
Steps to follow:

- Assemble the materials, and clean the material which is needed to be joined. To clean its grit and surfaces of grime you can do it with the help of rag, water and soap. And before buffing for smooth and dry, clean all blemishes and scuffs. By using alcohol swab you can prevent the outside chemicals causing harm to the surfaces.

- Before using argon gas it should be checked whether it is pure or not because small amount of impurity can cause damage to the titanium materials. To check the purity of the argon gas start flowing it before it is set in high frequency. If there are no signs of discoloration after few movements of its flow then it is pure argon gas.

- Now start the welding process with the argon gas flowing in high frequency. If there are any signs of swirled pattern emerging then your argon flow is too high. Reduce the flow level.

- During the entire welding process ensure that there is flow of shielding gas. Do not compromise on color and the integrity of the material.

- Handle the material carefully Use only cotton gloves to handle. Gloves already been used can cause damage to the material.

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Projection Welding Advantages

Friday, January 22nd, 2010
  • Simultaneously we can make any number welds in heavier materials easily.
  • Projection welds can be made in metals that are too thick to be joined by spot welding.
  • When you compare with spot welding, projection welding interferes less scale, oil, rust and work metal coatings.
  • Lower Electrode Maintenance.
  • Less Welding Current Required.
  • Projection welding life is longer than spot welding.
  • Lower amount of current and pressure needs to joint metals.
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Plasma Arc Welding Overview and Disadvantages

Wednesday, January 20th, 2010

Plasma Arc welding is a method of welding process, similar to Tig welding. PAW is an abvanced method of tig welding, which is designed to increase high productivity

Disadvantages

  • High Equipment Expense
  • Need More Operator Skills
  • Complex Welding Procedures
  • Producing Heavy Noise Level
  • Producing Higher Ozone Production
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Overview Submerged Arc Welding

Tuesday, January 19th, 2010

Submerged arc welding is an arc welding process and often referred as SAW. This gives welders with many advantages, from reducing UV radiation and providing a higher quality weld.

Advantages

  • High Quality Weld
  • Minimum Operator Skills Required
  • Suitable for all welding environments
  • Well suited for welding carbon, low alloy and alloy steel.
  • Relatively High metal deposition rates

DisAdvantages

  • We can weld only in Flat or horizontal
  • Need to preserve correct electrode alignment.
  • Irregular wire feed.
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Flux Core Arc Welding

Monday, January 18th, 2010
  • This process is mixture between Mig and Stick welding.
  • This process is same as Mig Welding, except instead of a shielding gas using in Mig Welding, there is flux in welding wire.

Advantages

We can Use it in All Environments.

Disadvantages

Need additional clean up to remove flux

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The Fundamental Process of Oxyfuel Gas Welding

Tuesday, January 12th, 2010

Oxyfuel gas welding (OFW) includes any welding process that uses combustion with oxygen as a heating medium

The process involves melting the base metal and generally a filler metal, using a flame produced at the tip of a welding torch.

The advantage of welding process is the control a welder can exercise over heat input and temperature, independent of the addition of filler metal. Weld bead size, shape, and weld puddle viscosity are also controlled in the welding process.

The fuel gases have one common property; they all require oxygen to support combustion. To suitable for welding operations and fuel gas when burned with oxygen, it contained the following:

- High  temperature flame
- High rate of flame propagation
- Adequate heat content
- Minimum chemical reaction of the flame with base and filler metals

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Stick Welders and its Functions

Monday, January 11th, 2010

Stick welders and the process of stick welding symbolize the most extensively used and recognizable form of an arc-welding.

The stick welding process is characterized by an application adaptability and suppleness and also relative simplicity in the stick welder and its related items.

Stick welders and the process of stick welding are mostly used by the small welding shop, by the home proprietor, by the farmer for repair of any equipment – as well as industrial production applications, structural steel creation and other commercial metals combination.

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Overview of Plasma Torches

Saturday, January 9th, 2010

Plasma torches are producing an arc, which struck normally as a direct arc between central electrode and the welding nozzle.

Different kinds of Plasma torches are available in the markets,

Benefits of Using Plasma Torch

  • Low Power Consumption
  • Cost Effective
  • Easy to Operate
  • No electronic circuit.
  • Minimum cost of spares
  • Light Weight
  • Better Efficiency
  • Time Save
  • Spares availability
  • Higher cut quality
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