Argon arc welding techniques and skills? There are several welding techniques for TIG welding

TIG welding is a welding technique that uses argon as a shielding gas. Also known as argon shielded welding. That is, argon shielding gas is introduced around the arc welding to isolate the air from the welding area and prevent the welding area from being oxidized.

Next, I will tell you in detail about the method of TIG welding spot welding, as well as the skills and techniques of welding.

1. TIG welding spot welding?

1.Before welding, prepare the argon cylinder, install the argon flowmeter on the cylinder, and then connect it with the air inlet on the rear panel of the welding machine with a gas pipe, and make sure that the connection is tight to prevent air leakage.

2.Connect the TIG welding gun, gas connectors, cable quick couplers, and control connectors to the corresponding sockets of the welding machine. The workpiece is bolted with a "+" connection by means of a welded grounding wire.

3.Connect the power cord of the welder and check whether the grounding is reliable.

4.After the power is turned on, select AC argon arc welding or DC argon arc welding according to welding needs, and turn the line switch and control switch to AC or DC gear. Note: These two switches must be used simultaneously.

5.Set the welding mode switch to the TIG welding position.

6.Turn on the argon cylinder and flow meter and turn the gas test switch to the "Gas Test" position. At this point, the gas flows out of the welding torch. After adjusting the gas flow, turn the gas test and welding switch to the "weld" position.

7.The welding current can be adjusted by the current adjustment handwheel, and the clockwise rotation current decreases, and the counterclockwise rotation current increases. The adjustment range of the current can be determined by the current size transfer switch.

8.Select the appropriate tungsten rod and the corresponding chuck, and then grind the tungsten rod to a suitable taper and install it in the welding gun. After the above work is completed, press the switch on the welding torch to weld.

TIG welding tutorials include pre-welding, welding, and arc retraction.

1. Before welding. Check whether the equipment, water, gas and circuit are normal, whether the welding parts and welding torch connection method meet the requirements, whether the specification parameters are properly debugged, and after all are normal, connect the power supply, water source and gas source.

2. Welding. The tungsten terminal of the welding gun is aligned with the welding seam starting point, the distance between the tungsten electrode and the workpiece is 1-3mm, press the welding switch, air supply in advance, high-frequency discharge arc starting, the welding gun maintains an inclination angle of 70°-80°, and the inclination angle of the welding wire is 11°-20°, and the welding gun moves in a straight line at a uniform speed, and the molten pool is observed during the movement.

The feeding speed of the welding wire should be matched with the welding speed, and the welding wire should not be in contact with the tungsten electrode, so as not to burn out the tungsten electrode and the welding gun. At the same time, according to the color of the weld metal, the argon protection effect is judged.

3. The method of arc tightening.

1) At the end of welding, more wire metal should be added to the weld terminal to fill the arc pit. After the arc is extinguished, stay at the arc extinguishing place for a longer period of time so that the weld terminal is fully protected by argon gas to prevent oxidation.

2) Use the current attenuation device of the welding machine to close the control button before the end of the weld, at this time the arc continues to burn, and the welding continues until the arc is extinguished, so as to ensure that the end of the weld will not burn through and ensure the quality of the weld.

3) For the weldments of important structures, arc striking plates and arc extinguishing plates should be installed at both ends of the welds. The welding arc is carried out on the arc striking plate, and the arc extinguishing is carried out on the arc extinguishing plate, which ensures the quality of the front point and terminal of the weld.

Novice (beginner) TIG welding spot welding skills:

Pay attention to the time of holding down the shape, press the thick material - some, you can try it yourself, feel it out, and grasp the wire feeding time, it is easy to weld through after melting, and the stainless steel thin material is gently pressed, pay attention to the different welding machine time is different, find the feeling yourself.

Thin materials can be welded without wire, hold the tungsten needle with your hand and gently tap it against the place to be welded. If it is easy to burn through the weldment, it is necessary to adjust it slightly, and the size should not burn through the weldment, and the speed of melting the welding wire will slow down after the current is small.

When the welding is proficient, the current can be slowly increased, and the speed and appearance will be prompted. The difficulty in starting welding is that the hand should be steady, the distance between the welding pin and the wire should be controlled properly, and the shrinkage should be free, which requires the accumulation of experience.

After the arc is ignited, it is necessary to preheat the place where the weldment starts for 3-5 seconds, and start feeding the wire after forming a molten pool. When welding, the angle of the welding wire and the welding gun should be appropriate, and the welding wire should be fed evenly. The welding torch should move forward smoothly, swing left and right, be slightly slower on both sides and slightly faster in the middle.

Pay close attention to the changes in the molten pool, when the molten pool becomes larger, the weld becomes wider or the concave appears, the welding speed should be increased or the welding current should be re-adjusted. 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.

If argon arc welding can only be spot welded, it is to fix the spot welding position of the weldment, put the tungsten electrode in the gun mouth, and then put the welding wire on the weld, but most of the points can not be pointed, and it is easy to burn through the weldment.

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The operation method of TIG welding:

The operation of argon arc welding requires the cooperation of both hands and harmonious operation. That is, one hand controls the welding wire, according to the change of the weld pool, evenly feeds the welding wire, and controls the welding gun with the other hand to maintain the stability and travel speed of the welding handle.

There are two ways to feed the welding wire, one is to hold the welding wire without moving, and send the welding wire into the weld pool through the swing of the arm, which is suitable for spot welding or welding when it needs to be interrupted.

Another finger continuation method is to sandwich the welding wire between the thumb and index finger, rely on the little finger and the nameless food as support, through the forward movement of the thumb, continue to evenly send the welding wire into the molten pool, this wire feeding method is suitable for long-term, continuous arc welding. However, it is necessary to master the skills, speed and frequency of wire feeding through continuous practice, so as to reach the point of free application and handy.

On the one hand, the hand holding the welding torch needs to control the speed according to the change of the weld pool, and on the other hand, it is necessary to select the handle method according to the shape, thickness, and whether there is a groove of the workpiece.

For example, for thinner workpieces, it is normal to use the method of linear rapid handling or linear reciprocating handling to reduce the time that the workpiece is affected by high temperatures.

For thick-walled welding with groove, a zigzag or crescent-shaped handle will be used to increase the pause time on both sides, so that the molten pool can penetrate the workpiece and ensure the internal welding quality.

For thick workpieces on one side and thinner parts on the other, the R-type welding method will be used, that is, the pause time will be increased at the thick part end, and the thin part end will pass quickly to achieve the workpiece melting without melting.

Argon arc welding is about the harmonious coordination of the hand and eye, through the judgment of the welded workpiece, adjust the appropriate current, choose the appropriate gun handling technique and reasonable gun speed to weld, which has a step-by-step process.

TIG welding requires a lot of practical exercises to achieve harmonious use of both hands, and then observe the changes of the molten pool through the eyes to achieve the perfect weld. This requires a process of experience and experience.

TIG welding is a welding technique that uses argon as a shielding gas. It is also known as argon gas shielded welding. It is mainly used to pass argon shielding gas around the arc welding to isolate the air from the welding area and prevent oxidation in the welding area.

The main thing is that it is skillful, the thickness of the plate and the time of clicking, as well as the current are all connected, and they should be matched very well. It's not about saving gas, as long as you don't drive too much.

TIG welding techniques and skills

1. Whether it is argon arc welding or electric welding, the workpiece must be dealt with first, especially the consistency of the welding surface;

2. The principle of argon arc welding and electric welding is basically the same.

Electric welding is to connect the iron wire, adjust the current size of the welding machine according to the size of the welding surface of the workpiece, and produce the contact surface of the high-temperature melted parts when the electric short circuit is carried out through the electrode, and the jacket material of the welding rod plays the role of welding aid to ensure the success of welding;

Argon arc welding uses the arc with argon gas at the same time to weld, its welding surface is smaller, the workpiece is required to be more exquisite, the welding process is exquisite, and it needs to be operated carefully.

No matter what you do, as long as you are careful and serious, practice makes perfect, and the more you do, the more experienced you are, and the higher your skills.

Summary. Answer: There are generally two kinds of welding: left welding method and right welding method.

Answer: There are generally two kinds of welding: left welding method and right welding method.

1.Wire feeding: With a larger current, pinch the welding wire with the left hand and send it to the molten pool for welding, and the groove gap is required to be small or no gap.

2.Welding handle: The crank is to press the nozzle nozzle the weld, and shake the arm greatly for welding.

The mop is the welding nozzle gently leaning on or not leaning on the weld bright mold, the little finger or ring finger of the right hand is also leaning on or not leaning on the workpiece, the arm swings small, and the welding handle is dragged for welding. 3.Arc strike:

The arc starter is used to respect the bending, and the contact arc is used when there is no arc starter. 4.Welding:

The angle of the welding wire and the welding gun should be appropriate, and the welding wire should be evenly fed. 5.Arc Closure:

The welding torch with an arc starter should be intermittently closed or adjusted to the appropriate arc closing current to slow the arc, and the welding machine without an arc starter should slowly lead the arc to the side of the groove.

Extreme argon arc welding is the welding of argon as a shielding gas. With the help of an electric arc created between the tungsten electrode and the weld body, the welding material itself (which is also melted when filler metal is added) is heated and melted, and then the weld metal is formed. Tungsten electrodes, molten pools, arcs, and joints heated by arcs.

area, protected by argon gas streams and not polluted by the atmosphere. During TIG welding, the relative positions of the torch, filler metal and weldment are as follows:

The arc length is generally times the diameter of the tungsten electrode.

When the welding is stopped, the filler metal is first withdrawn from the weld pool (the filler metal is added according to the thickness of the weldment), and the hot end still needs to stay in the argon gas flow.

Protect to prevent oxidation.

1.Welding torch (torch).

In addition to clamping the tungsten electrode and delivering the welding current, the tungsten argon arc welding torch (also known as the welding torch) also sprays a shielding gas. The high-current torch is welded for a long time.

A water-cooled welding torch is also required. Therefore, it is very important to use and protect the welding torch correctly.

Tungsten electrode load current capacity (a).

Tungsten electrode diameter (mm): pure tungsten, thorium, tungsten, cerium tungsten 20-60, 15-80, 20-80, 40-100, 70-150, 50-160, 60-150, 100-200, 100-200

2.Gas circuit The gas circuit is composed of argon cylinder pressure reducing valve, flow meter, hose and solenoid valve (in the welding machine). Pressure reducing valves are used to reduce pressure and regulate the pressure of shielding gases.

The flowmeter is to calibrate and adjust the shielding gas flow, and the argon arc welding machine usually adopts a combined and integrated decompression flowmeter, which is convenient and acceptable.

Depend on. 3.Argon purity.

The requirements of argon purity of the material during argon arc welding.

Metal Material: Chromium-nickel stainless steel, Too refractory metal, Argon purity (%)

4.Specification parameters.

The specification parameters of tungsten argon arc welding are mainly composed of current, voltage, welding speed and argon flow, and their values are related to the type of material to be welded, plate thickness and joint type. Other parameters, such as the length of the tungsten electrode extending out of the nozzle, are generally taken as 1-2 times the diameter of the tungsten electrode, and the distance between the tungsten electrode and the weldment (arc length) is generally taken below the times.

The tungsten electrode diameter, nozzle size, etc. are selected after the welding current value is determined. Generally, the specifications of stainless steel argon arc welding are as follows: Current type and polarity Plate thickness Welding current (a) Argon flow rate (l min) Wire diameter DC positive connection 30-50 4