Argon welding equipment and Welder Work Tools?

The picture above shows the series of components in Argon welding.

Welding using argon welding can be done if all the components are available. What are the components?

1. AC / DC welding machine

Is a generator welding machine used in welding tungsten gas welding? The choice of AC or DC current usually depends on the type of metal to be welded.

2. Protected gas cylinders

Cylinders for storage of protected gas such as argon and helium are used in welding tungsten gas.

3. Regulator and Flowmeter

Gas pressure regulators that will be used in tungsten gas welding. On this regulator, it is usually shown the working pressure and gas pressure in the tube. While the Flowmeter is used to show the amount of protected gas flow used in welding tungsten gas.

4. Gas Hose

The gas hose serves as a link to the flow of gas from the tube to the handlebar welding.

5. Electrode Cable (welding cable)

Electrode cable/welding cable serves to deliver current from the welding machine to the welding handlebar, the mass cable serves to conduct current to the workpiece. The placement of the mass cable is on a positive (+) or negative (-) pole depending on the type of material being welded.

6.Cable Adapter (connecting)

Connecting is used to tie or connect welding cables and gas hoses to the welding handlebar.

7. Welding handlebar

Serves to unify the welding system in the form of arc ignition and protection of the protected gas during the welding process.

8. Tungsten Electrodes

Serves as a flame generator during welding. These electrodes do not function as additives.

9. Welding Wire

Serves as added material. Add a welding wire if the base material is heated with a tungsten arc already close to liquid.

* For certain types of work required additional accessories such as water cooling systems, rheostat legs, and arc timers.


Peralatan Kerja Welder Argon/GTAW

The equipment used by a welder in welding argon / GTAW includes:

  1. Welding hood
  2. Glass welding hood
  3. Apron, breast and hand protectors
  4. Argon special gloves
  5. Grinda
  6. Power cable
  7. Cipping, a kind of small hammer that ends flat and the other ends form cones.
  8. Brush, to clean welds and surroundings.
  9. Small flashlight, to observe the inside of the pipe.
  10. Special mask

Understand Las Argon with equipment and results
Las Argon - A very popular welding process among ordinary people is Las Argon. Las Argon is widely known to the public as harmful welding, but it has a sufficiently high content. What Exactly Is Argon Tired? The name Las Argon comes from the word "argon", which is an element of a noble gas group that has the same name as the Ar symbol process.

Due to its noble (inert) nature, argon itself acts as a protective gas (protective gas) during welding, so that the gas does not react with the surroundings. These properties make argon gas an ideal protective shield during the welding process. Argon gas applications are intended for MIG (Metal Inert Gas) and WIG (Tungsten Inert Gas) welding. But most of what ordinary people understand by argon welding is TIG welding. This article discusses some important points related to argon welding (tungsten inert gas).
Argon welding machine:

Some equipment is required to start TIG welding. The device that needs to be prepared is a little more than electric welding machines in general. If we compare rod welding (SMAW) with argon welding, the difference becomes very clear.

If the similarities only refer to the welding transformer, most welding transformers on the market can be used as SMAW and GTAW welding transformers. Furthermore, there is no longer any similarity in terms of the equipment required. TIG equipment includes:
Argon welding equipment
Peralatan Mesin Las Argon
  • Power Source.
Power Source is an energy source used to power the GTAW welding arcs. Electricity from a socket is changed by a step-up transformer circuit in the power source so that it has a voltage and electric current high enough to be used for welding. The output of the welding machine can vary depending on the type.
Welding machines can produce direct current electricity (Direct Current), alternating current (Alternating Current), or both by simply pressing the button on the welding machine to change the type of output current. Especially for the GTAW welding machine, there are some additional functions such as for a shielding gas regulator and control of the control pedal.
  • Inert Gas Supply.
Inert Gas Supply is a cylindrical tube containing noble gas (inert) which is used to supply the welding gas shielding gas requirements. Gas cylinders used have varying capacities, ranging from 1 m3 to 10 m3. In general, the GTAW welding process uses argon noble gas. However, the noble gas helium is also widely used if argon is too rare to use.

In some cases, GTAW welding also uses types of active gases such as carbon dioxide (CO2) in the welding. Precious gases that are commonly used have several levels of purity, the most common being welding grade or industrial grade, with sufficient purity standards. High purity grade has a purity higher than industrial grade and ultra-high purity has a purity level of 99.99% making it the highest level in terms of purity.
Flowmeter and Regulator.
Regulator GasFlowmeter and Regulator are parts that function to regulate the flow rate of gas from the supply cylinder. In addition to the open-close valve on the supply tube, the regulator also has a valve to regulate the working pressure of the protective gas. The regulator is also equipped with two indicators, each of which serves to determine the working pressure of the gas and the remaining gas volume. Still a series there is a flowmeter that serves to regulate the flow rate of gas flow. To determine the flow rate of the gas flow itself depends on the type of gas, the welding position, and the conditions around the windy welding work or not. Some types of regulators, especially the CO2 gas regulator, are equipped with heaters that function to prevent the formation of water vapor due to reaction with the surrounding air.
  • Cooling water.
Cooling Water serves to cool the torch so that it is not too hot due to continuous welding work. Because GTAW welding is usually carried out continuously with the heat generated by electric arcs that can reach 3,000oC so as to reduce damage to the torch some torch models are equipped with a cooling mechanism. For torches with a self-insulated or air-insulated cooling model, they come from protective air and gas flow. But for the water-insulated model, there is a special insulation hose that enters the torch handle. The hose serves to circulate the water so that the heat in the torch can be distributed through the flowing water.
  • Foot Pedal Fine Control.
Foot Pedal Fine Control is a tool that serves to regulate the size of the current used when welding is in progress. Especially for GTAW welding which tends to be complicated, this tool has many uses, such as to help light an electric arc without the need to make contact between the electrode and the parent metal and to prevent crater cracking by gradually turning off the electric arc. In addition, to prevent the occurrence of burn through defects and lack of fusion, the welder will usually utilize the functionality of this pedal.
  • Welding Torch.
  1. Welding Torch GTAWThe welding torch is the part checked by the welder during welding work. The torch, especially for GTAW, has a rather complicated part compared to other processes that tend to be simpler. At the rear, there are several entry and exit mechanisms. Such as the electrode cable which carries the electric current of the welding machines, the gas pipe which is a protective gas pipe, the water inlet and outlet pipe which functions to circulate the water for the cooling torch on the water-insulated torch.

  2. In addition, there is a torch handle that serves as a welder's handle in welding operations. The cap is used to cover the tip of the electrode which is generally too long not to be exposed when it is electrified because it can be dangerous in the event of an unexpected short circuit. The collar is used to tighten the electrode so as not to move when it is used. The gas port nut is a bolt to place the gas from the port which is used to spray shielding gas into the area of ​​the welding crater.

  3. The gas nozzle is used to direct the jet of gas to be collected at the point of the welding crater which requires protection against gases. The tungsten electrode is a tungsten electrode which is used to ignite arcs, this electrode is a type of electrode which is not powered because it has a higher melting point than the material to be welded and is not used only on GTAW.
    Las Argon results
Hasil Las Argon
Argon welding is welding that is quite difficult in practice. This is because there are too many variables that must be set to maintain the quality of welding itself. The number of variables is nothing but caused by the material being welded is indeed a material that has low weldability, so it cannot be careless in welding the material. However, in the hands of a diligent and experienced welder, the connection quality of argon welding is high beyond other welding processes.

GTAW welding is indeed commonly used to weld jobs that cannot be welded using other processes. GTAW becomes a kind of ace if a job is unsuccessful to be connected with another welding due to several problems. These problems are usually related to the material. Material with low weldability means that the material cannot be welded without changing the mechanical or chemical properties that are important characteristics of the material.

Examples such as duplex stainless steel material which has a mixture of austenitic and ferritic stainless steel compositions. The heat input to the material can affect the composition of the austenite and ferrite, the effect of corrosion resistance or mechanical properties will decrease. Therefore the material cannot be welded using processes such as SMAW or FCAW which regulate the heat input in the welding process which is difficult to control. GTAW is suitable because GTAW welding is more flexible because there are many variables that can be varied in this welding process. In addition, GTAW welding is also superior for application in thin material welding, even when the welding process does not require filler metal (autogenous welding).

To produce a quality welded joint, the welder must pay attention to and know each and every variable that works in his work. Experience is very important in mastering GTAW welding. Sufficient experience can make a welder observant of the problems that occur. Problems such as turbulence of the welding crater due to the gas flow that is too heavy, but if the protective gas is not too heavy, it will cause defects like porosity.

The choice of a pointed or blunt electrode tip is also influential. Generally, to produce sufficient penetration, the tip of the electrode is blunted. However, the arc flame is less diffused on the blunt electrode and will risk causing incomplete fusion defects. The pointy tip of the electrode can overcome the problem of lack of fusion, but it is quite difficult to maintain the electrode shock due to deformation due to heat exposure, besides the pointy electrode is also prone to contamination when melting into the welding crater known as tungsten inclusion.

The choice of electrode type which has a higher melting point such as EWCe to replace EWP can overcome this. But even if the EWCe type with different trademarks can mean the quality is not the same. Add a series of variable lengths that the welder must understand.

However, to produce a quality connection is not impossible. With enough experience and perseverance, there is enough welder who is able to master GTAW welding. The effort will also be paid off with the salaries of GTAW welders, which are far above the average salary of other welders.

Because GTAW welding is classified as non-feed welding, which means that electrodes and filler metals are separate entities not as one as in other welding processes. The filler metal used in GTAW welding is usually made of the same or similar material as the welded parent metal. For the electrodes themselves, the main material of the electrode is tungsten, a conductor metal that has a higher melting point than other metals.

In addition, tungsten (tungsten) is also mixed with other elements to obtain certain properties such as higher melting points. Dimensionally, tungsten electrodes have a diameter of 0.5 to 6.4 millimeters and a length of 75 to 610 millimeters. Codification of tungsten electrodes for GTAW is regulated by the American Welding Society in AWS 5.12 which contains the following:
Types of Tungsten Electrodes:
Elektroda Tungsten
  • Wolfram Pure electrode (green color)
The Wolfram Pure Electrode (EWP) is a pure tungsten electrode with a green color code. At the lowest price compared to other types of electrodes. The advantage of this type of electrode is only in the price, with not too superior electrode properties. These electrodes can be used to weld aluminum and magnesium.
  • Wolfram thorium oxide electrode (yellow and red)
Wolfram Thorium Oxide electrode (EWTh), which is a tungsten electrode mixed with the element Thorium with a content of 1% for the yellow color code and 2% for the red color code. These electrodes excel in arc stability and initial ignition tends to be easier. However, thorium is a radioactive element that can have environmental impacts due to waste and health effects for welders.
  • Wolfram cerium oxide electrode (orange)
The Wolfram cerium oxide electrode (EWCe) is a tungsten electrode with a mixture of cerium elements with a content of 2% with an orange color code. The advantage of this electrode is its resistance to heat which prevents fusion and contamination. These electrodes also produce stable arcs and easy starting, like the EWTh type. But these electrodes do not have radiation risks like the EWTh type.
  • Wolfram Lanthanum Oxide electrode (black)
The Wolfram lanthanum oxide electrode (EWLa) is an argon welding wire with a mixture of lanthanum elements with levels of 1% for the black color code, 1.5% for the gold color, 2% for the blue color code. It has a similarity with EWCe type electrodes.
  • Wolfram zirconium oxide electrode (brown)
The tungsten zirconium oxide electrode (EWZr) is a tungsten electrode with a mixture of zirconium elements with levels of 0.3% and has a brown color code. The zirconium mixture increases the melting point of the electrodes so that they are able to withstand high currents and are more durable.
Aluminum Welding

Aluminum welding is fairly complicated welding. Aluminum has slightly different characteristics from steel. Material from aluminum is more reactive to heat when compared to steel. The resistance value of aluminum is also higher, causing the heat generated from electric arcs to be greater with the same current. Thermal conductivity and thermal expansion of aluminum are also higher.
So that excess heat will cause deformation and areas affected by extensive heat. In addition, the surface of aluminum is also protected by a chemical layer of aluminum oxide which has a higher melting point (around 2000 oC) than aluminum itself (around 650 oC). So that welding can not be done before this layer is penetrated.

These problems can be overcome by using argon welding or GTAW. The heat input from argon welding is not very high when compared to other weldings like GMAW or SMAW so that it can overcome the heat input problem that is often found when doing aluminum welding.

For the problem of the emergence of aluminum oxide film on the surface of the parent, metal can be overcome in several ways, one of which is to brush the surface before welding. However, even though it has been brushed using a wire brush, sometimes the film layer on the surface of the parent metal does not disappear entirely. However, GTAW welding has a cleaning action feature that can help clean the aluminum surface of the aluminum oxide layer during the welding process.

GTAW welding on aluminum material is a very appropriate choice. The results of argon welding on aluminum material are also quite good and efficient. Aluminum welding can use EWP type electrodes, although these are relatively inexpensive.

The diameter used depends on the thickness of the material to be welded. Protective gas must use noble gases, for better cleaning action you can use helium gas, for better visual quality you can use argon gas. The gas discharge used can adjust the conditions when welding.

The choice of polarity for aluminum welding is also important. The recommended polarity is back and forth (AC) to get a balance between penetration and cleaning action. Straight polarity (DC-) gives a better cleaning action effect but has problems with poor penetration. Whereas reverse polarity (DC +) provides deeper penetration without effecting cleaning action.
Determining the shape of the electrode tip is also very important in welding aluminum. Generally, a pointed electrode will be more useful because it can provide a wider cleaning action. However, if the electrode used is the EWP type and the current user is relatively high. Then the pointed tip is not recommended for use because it will be at high risk of tungsten inclusion. To overcome this, you can use a round-ended electrode, by attaching the tip of the electrode to the parent metal and slightly pressing it to form a round ball.

The signs above are general signs for welding aluminum using argon welding. The experience of each individual can vary, but will not be far from the above signs. In starting the melting of the parent metal and the filler metal must not be in a hurry. Welding should only begin when the molten parent metal has been seen because it usually takes some time to penetrate the aluminum oxide layer on the surface of the parent metal.
The Las Argon Way

Like other arc welding processes, argon welding has many similarities in how it works with welding processes such as SMAW, GMAW, and FCAW. The power source is increased in power to the step-up transformer in the welding machine in accordance with welding requirements. The electricity is supplied through 2 wires, each connected to the main metal (work lead) and connected to the torch (electrode lead).
Electric current on the cable will only flow when the switch button on the torch handle is pressed. Along with the flow of electric current, protective gas will also flow around the electrode. This gas will ionize when there is a short-circuit contact between the electrode tip and the parent metal. Ionized gas acts as a bridge for electrons to move from one electric pole to another, becoming an arc that lights stably.

Switching electrons involves the separation and joining of electrons from an element. This process produces energy that is large enough to produce heat which is used to melt the parent metal and filler metal. Besides functioning as a connecting media and arc stabilizer, the protective gas also has the main function to cover the area of ​​the welding crater from the gases that can contaminate the welding crater, such as oxygen and hydrogen