How to weld TIG welding well, and how is TIG welding welded?

The welding method is the same as that of other stainless steel materials. The black needle can not come out, just keep the muzzle of the gun flat. Welding stair handrails is generally spot welded, you put the welding wire at the welding port, black is aimed at the welding wire and then press the switch for seconds.

It should be noted that the black needle and the welding wire should not be separated by 1 mm during welding, and the current should be adjusted well, so that the welding is beautiful.

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.

Beginner TIG welding spot welding skills.

1. Novice (beginner) argon arc welding spot welding skills:

Pay attention to the time of holding down the shape, press some thick materials, 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 times are different, and 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 wire feeding 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.

2. 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 them cannot be pointed, and it is easy to burn the weldment through.

In fact, learning argon arc welding spot welding is not as difficult as you think, according to Mr. Song's method, practice more, try more, and constantly find your own speed, melting point, and aesthetics. You can grasp it slowly.

The skill of learning argon arc welding spot welding is to press and hold the switch for a short time, press the material thickness a little longer, and send the welding wire inside, when it is burned, it is easy to burn through without sending the welding wire; In addition, you can weld very thin plates without adding welding wire, and hold the tungsten needle with your hand. Gently tap your mouth flat against the area to be welded.

Features of TIG welding:

1. High efficiency.

The current density is large, the heat is concentrated, the deposition rate is high, and the welding speed is fast. In addition, it is easy to start arcing. It is necessary to strengthen protection because the arc light is strong and the smoke is large, so the protection should be strengthened.

2. Shielding gas.

The most commonly used inert gas is argon. It is a colorless and odorless gas, the content of air is calculated by volume), and the boiling point of argon is 186, which is between the boiling points of oxygen and helium.

Argon is an ideal shielding gas, which is 25% denser than air, which is conducive to the protection of the welding arc and reduces the consumption of shielding gas. Argon is a chemically inactive gas, which does not react with metals even at high temperatures, so there is no oxidation and burning loss of alloying elements and a series of problems caused by it. Argon is a monoatomic gas that exists in an atomic state with no molecular decomposition or atomic endothermic phenomena at high temperatures.

The specific heat capacity and heat conduction capacity of argon are small, that is, the absorption capacity is small, the heat transfer to the outside is also less, and the heat in the arc is not easy to lose, so that the welding arc burns stably and the heat is concentrated, which is conducive to the welding.

TIG welding is GTAW.

Generally, the tungsten electrode specification is cerium tungsten electrode, and the current is controlled between 80 and 140, according to the plate thickness or wall thickness.

If welding thin steel plates,A current of 40 60 is sufficient.

Gas is generally said to be the flow rate, rarely talk about the pressure, the flow rate is generally 10 15l min.

For beginners, it is necessary to practice the basic skills first, that is, the posture, to ensure the stability of the welding gun, stability is very important for the control of the welding process, otherwise the welded weld is high and low, wide and narrow, and the weld is not straight.

1. Argon arc welding must be operated by a special person. 2. Check whether the equipment is noisy and whether the tools are good before work. 3. Check whether the welding power supply, the control system has a grounding wire, and the transmission part is lubricated.

The rotation should be normal, and the argon and water sources must be unblocked. If there is any water leakage, it should be repaired immediately. 4. Check whether the welding torch is normal and whether the ground wire is reliable.

5. Check whether the high-frequency arc striking system and welding system are normal, whether the wire and cable joints are reliable, and check whether the adjustment mechanism and wire feeding mechanism are in good condition for automatic wire argon arc welding. 6. Select the polarity according to the material of the workpiece, connect the welding circuit, use DC positive connection for general materials, and reverse connection or AC power supply for aluminum and aluminum alloy. 7. Check whether the welding groove is qualified, there shall be no oil stain and rust on the surface of the groove, and the oil and rust should be removed within 200mm on both sides of the weld.

8. Check the reliability of the fetal tool, and check the preheating equipment and temperature measuring instrument if the weldment needs to be preheated. 9. The argon arc welding operation button should not be far away from the arc, so that it can be closed at any time in the event of a failure. 10. When using high-frequency arc striking, it is necessary to check whether there is leakage.

11. If the equipment fails, the power should be cut off for maintenance, and the operator shall not repair it by himself. 12. It is not allowed to be naked and naked in other parts near the arc, and it is not allowed to smoke or eat near the arc, so as to avoid ozone and smoke inhalation into the body.

The operation process of argon arc welding is that the argon cylinder should be prepared before welding, and the argon flowmeter should be installed on the cylinder, and then the air inlet hole on the back panel of the welding machine should be connected with the air pipe, and the connection should be tight to prevent air leakage; Connect the argon arc welding gun, gas joint, cable quick connector, and control joint with the corresponding socket of the welding machine. The workpiece is connected with the " " bolt by welding ground wire; Connect the power cord of the welding machine and check whether the grounding is reliable, etc.

TIG welding operation is resistant to shouting:

1. Before welding, the argon cylinder should be prepared, and the argon flowmeter should be installed on the bottle, and then the gas resistance tube should be connected to the air inlet hole on the back panel of the welding machine, and the connection should be tight to prevent air leakage.

2. Connect the argon arc welding gun, gas joint, cable quick connector and control joint with the corresponding socket of the welding machine. The workpiece is connected with the " " bolt by welding ground wire;

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

4. After connecting the power supply, choose AC argon arc welding or DC argon arc welding according to welding needs, and move the line transfer switch and control transfer switch to AC (AC) file or DC (DC) file. Note: The two switches must be used synchronously.

5. Put the welding mode switch in the "argon arc" position.

6. Open the argon cylinder and flowmeter, pull the gas test switch to the "gas test" position, at this time, the gas flows out from the welding Chang Li gun, adjust the air flow, and then pull the gas test and welding switch to the "welding" position.

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

8. Select the appropriate tungsten rod and the corresponding clamp head, then grind the tungsten rod into a suitable taper, and install it in the welding gun, and press the switch on the welding gun after the above work is completed.