How to burn argon arc welding, how to learn argon arc welding for novices

Burning TIG welding skills

1. External filler can be usedFor priming and filling, it is to use a larger current, the welding wire head is on the front of the groove, the left hand pinched the welding wire, and constantly sent to the molten pool for welding, and the groove gap is required to be small or no gap.

2. The inner filament can only be used for root welding, which is to use the thumb, index finger or middle finger of the left hand to cooperate with the wire feeding action, the little finger andRing fingerClamp the welding wire to control the direction, and the welding wire is close to the blunt edge on the inner side of the groove, and melt it together with the blunt edge for welding, and the groove gap is required to be greater than the diameter of the welding wire, yesplatesIf so, the wire can be bent into an arc.

3. Arc striking device (high-frequency oscillator or high-frequency pulse generator) is generally used, tungsten electrode and weldment do not contact to ignite the arc, and contact arc striking is used when there is no arc initiator (mostly used for construction site installation, especially high-altitude installation), which is availableCopperOr graphite is placed on the groove of the weldment to start the arc, but this method is more troublesome, less used, generally with a slight stroke of the welding wire, so that the weldment and the tungsten electrode are directly short-circuited and quickly disconnected and ignited the arc.

Property analysis. Argon arc is a kind of operation with both left and right hands at the same time, which is the same as the left hand to draw a circle and the right hand to draw a square in our daily life, so it is recommended to carry out similar training for those who have just begun to learn argon arc welding, which is helpful to learn argon arc welding.

When the molten pool is not fused well and the wire feed has a feeling of not being sent, it is necessary to reduce the welding speed or increase the welding current, if it is a root weld, the attention of the eyes should be concentrated on the blunt edge of the groove, and the afterglow of the corner of the eye is on the opposite side of the seam, and pay attention to the change of the rest of the height.

In our country, welding operations need to be licensed, welders are the type of work that belongs to the access category, in the professional qualifications of skilled personnel, only five of the 81 types of work in the access category, welders are one of them, and the actual situation is that most of the industry practitioners are unlicensed operations. With the continuous standardization of technology and the relevant requirements of the industry, more and more people want to take a welding certificate, the advantage of the certificate is still very large, first of all, the salary of the certificate and the non-certificate are very different, often able to reach more than double or higher level. Therefore, the issue of short-term welder training has naturally become a concern for practitioners.

Welding as an industrial "tailor" is a very important means of processing in industrial production, the quality of welding plays a decisive role in the quality of the product, so, what is the future development of welding technology?

Industry outlook. With the development of production, welding is widely used in aerospace, aviation, nuclear industry, shipbuilding, construction and machinery manufacturing and other industrial sectors, in China's economic development, welding technology is an indispensable means of processing. After entering the 21st century, welding is an important part of the manufacturing industry, and the rapid development, so it has brought unprecedented development opportunities to the welding industry.

At present, China consumes 300 million tons of steel every year (about tons of welded structure), and needs about 750,000 welding machines, and the welding industry will continue to grow in the next 8 10 years.

1. Argon protection can isolate the adverse effects of oxygen, nitrogen, hydrogen and other gases in the air on the arc and molten pool, reduce the burning loss of alloying elements, and obtain dense, spatter-free and high-quality welded joints;

2. The arc of argon arc welding is stable, the heat is concentrated, the arc column temperature is high, the welding production efficiency is high, the heat affected zone is narrow, and the weldment stress, deformation and crack tendency of the weldment are small;

3. Argon arc welding is open arc welding, which is convenient for operation and observation;

4. The electrode loss is small, the arc length is easy to maintain, and there is no flux and coating layer during welding, so it is easy to realize mechanization and automation;

5. TIG welding can weld almost all metals, especially some refractory metals and easily oxidized metals, such as magnesium, titanium, molybdenum, zirconium, aluminum, etc. and their alloys;

6. It is not limited by the position of the weldment, and can be welded in all positions.

1. Welding example: the material for economizer, evaporation section pipe bundle, water wall and low-temperature superheater is 20 steel, and the high-temperature superheater tube is 12cr1mov.

2. Quasi-slip pure dispatch before welding: before welding, the nozzle should be beveled at 30°, and the metal color should be polished within 15mm inside and outside the pipe end. The pipe to the mouth clearance is 1 3mm.

When the actual counterpart gap is too large, the transition layer needs to be surfacing on the bevel side of the pipeline. Set up temporary shelter facilities to strictly control the wind speed at the welding operation, because the wind speed exceeds a certain range, it is easy to produce pores.

3. Operation: WST315 manual tungsten argon arc welding machine is used, and the welding machine itself is equipped with a high-frequency arc striking device, which can be used for high-frequency arc extraction. Arc extinguishing is different from electrode arc welding, if the arc extinguishing is too fast, it is easy to produce arc pit cracks, so the weld pool should be led to the edge or thicker part of the base metal during operation, and then gradually shrink the melt pool to slowly extinguish the arc, and finally close the shielding gas.

For No. 20 steel pipe with a wall thickness of 3 4 mm, the filling material can be TIGJ50 (for 12Cr1 MoV, 08CrMoV), the diameter of the tungsten rod is 2mm, the welding current is 75 100A, the arc voltage is 12 14V, the shielding gas flow rate is 8 10L min, and the power supply type is DC positive connection.

Learning TIG welding can take some time and hands-on experience for novices. The following are the steps and tips for general novices to learn TIG welding for your reference:

1.Learn basic theoretical knowledge: understand the principle of argon arc welding, equipment structure, welding materials and process parameters and other basic knowledge. You can learn this knowledge by referring to relevant textbooks, ** tutorials, or attending professional training.

2.Master welding safety knowledge: learn safety precautions during the welding process, including wearing personal protective equipment such as protective glasses, gloves and fireproof clothing, ensuring a well-ventilated working environment, and using welding equipment reasonably.

3.Familiar with welding equipment: understand the main equipment of argon arc welding, including argon cylinders, gas regulators, welding power supplies, welding guns and welding wires, etc., and learn to use and adjust these equipment correctly.

4.Practice basic movements: Practice maintaining a stable handheld posture and the operation of the welding torch, and familiarize yourself with the movements of the hands and the feeding speed of the welding wire. Welding exercises can be performed on the exercise board to improve the stability and accuracy of welding.

5.Familiar with welding materials: understand the welding characteristics and requirements of different materials, select suitable welding materials, and master the steps of weld wire selection, preheating and cleaning.

6.Hands-on exercises: Choose the right welding project, such as welding sheets, fillet welds, or pipes, and practice them. Gradually become familiar with welding technology in practice and improve welding quality and efficiency.

7.Learn problem analysis and solution: When you encounter a problem in the welding process, learn to analyze the cause of the problem and take corresponding measures to solve it. You can use the guidance of professionals or refer to relevant teaching materials and resources.

8.Continuous learning and improvement: TIG welding is a high-tech welding method, which requires continuous learning and practice to improve one's technical level.

You can participate in relevant training courses, workshops or join the welding community to communicate and learn from other welding enthusiasts.

Through systematic learning and practice, master the basic technology and operation points of argon arc welding, and gradually improve the quality and efficiency of welding. Remember, TIG welding requires patience and persistence, and more practice and continuous learning are the keys to improving your technique.