What Does a Pipe Welder Do?

The electric welding machine uses the high temperature arc generated by the positive and negative poles in an instant short circuit to melt the solder on the welding electrode and the material to be welded, so as to combine the objects to be contacted. Its structure is very simple, it is a high-power transformer.

First, the advantages of electric welding machines: electric welding machines use electric energy to instantly convert electrical energy into thermal energy. Electricity is very common. Electric welding machines are suitable for working in dry environments without requiring too many requirements. Because of their small size, simple operation, convenient use, and speed Faster, strong weld seam after welding, etc. It is widely used in various fields, especially for parts that require high strength. It can be the same metal material (also can connect different metals, but the welding method is different) permanent. After the heat treatment of the welded joint, it has the same strength as the base material and has a good seal, which solves the problems of sealing and strength for the manufacture of storage gas and liquid containers.

The high-temperature arc generated by the positive and negative poles in an instant short circuit is used to melt the solder and the material to be welded on the electrode to achieve the purpose of combining them. The structure of the electric welding machine is very simple. To put it plainly, it is a high-power transformer.

1. The main welding machines used by industrial and mining enterprises are:

Serial number standard number standard name adopted

The use of electric welding machines is very wide. Whether it is a large shipbuilding enterprise, industrial and mining enterprise and various construction enterprises, electric welding machine is an indispensable tool. The electric welding machine is used for material welding, and it is charged when in use, especially some small construction units purchase cheap electric welding machines to save costs. Use in the harsh environment of the construction site can easily cause electric shock, fire, and desoldering. This phenomenon will endanger personal safety and property safety. Because the welding quality is not good, it will cause "tofu residue" project.

Some points to note when choosing a welding machine:

First, when choosing electric welding machine products, go to a regular manufacturing company or a big shopping mall, and buy brand-name products with high market share. Don't try to buy it at a small store cheaply, where the quality of the welding machine cannot be guaranteed.

2. When purchasing, check whether the nameplate on the product has the manufacturer s name, production address, specifications, welding current adjustment range, load duration, and input voltage and current, etc., and then determine which one you want to buy according to your work needs. Welder.

Third, you can ask the dealer to provide a product quality inspection report or certificate of compliance when purchasing. Because the welding machine product is a national compulsory certification product, you must confirm whether the product has passed the "3C" certification when purchasing. You can also check online.

4. When purchasing, be sure to check whether the product has a grounding screw. The grounding screw connection should be well grounded without paint. Whether the movement is clean and insulated to ensure that it is safe to use. It can also be checked if necessary.

5. Before you buy, you can check the operation, conversion and installation of the switch on the panel, the power indicator light is on, whether the fan is normal, whether there is abnormal vibration and beep sound in the power supply, whether there is an unusual smell, and whether the appearance There are heating phenomena such as discoloration to ensure the quality of the welding machine and give full play to the performance of the welding machine.

6. If you want to buy a gas shielded welding machine, you should also check whether the accessories are complete, whether the wire feeder is oily, whether the rotation is smooth, and whether the connecting cable matches the external insulation and is damaged to ensure the stability of the arc.

The electric welding machine uses the high temperature arc generated by the positive and negative poles in an instant short circuit to melt the solder and the material to be welded on the welding electrode to achieve the purpose of combining them. The structure is very simple. It is a high-power transformer. Generally, electric welding machines can be divided into two types according to the type of output power. One is AC power; the other is DC power. Do not underestimate the maintenance and maintenance during use of the welding machine.

Routine maintenance of electric welding machine

1. Check that the output wiring specifications of the welding machine are firm and firm, and that the outlet direction is close to vertical downward, and the included angle with the horizontal must be greater than 70 °.

2. Check the tightening of the screws at the cable connection. The screw specifications are hexagonal bolts M10 × 30. The flat washers and spring washers are complete, and there is no rust and oxidation.

3. Check that the exposed length of the cable at the wiring is less than 10mm.

4. Check that the welding machine casing is grounded securely.

5. Check that the power source and base material of the welding machine are well grounded and standardized.

6. Check that the cable connection is reliably insulated and wrapped with tape.

7. Whether the screen shield of the power line, welding cable and welding machine is intact.

8. Whether the cooling fan of the welding machine rotates flexibly and normally.

9. Whether the power switch, power indicator and knob of the adjustment handle remain intact, whether the pointers of the ammeter and voltmeter are flexible and accurate, and the surface is clear and free of cracks. The cover is intact and free to open and close.

10 Inspection

I. Preparation before welding

1. The welding machine should be placed in a ventilated and dry place and placed stably.

2. Check that the welding mask is free of light leakage and damage. Welding personnel and auxiliary personnel should wear labor protection supplies.

3 The welding tongs, power cords and all joints of the electric welding machine should be connected reliably and well insulated. Overheating is not allowed at the wiring place, the power wiring terminal must not be exposed, and it should be wrapped with electric tape.

4 The length of the wire between the electric welding machine and the welding clamp must not exceed 30 meters, and in special cases it must not exceed 50 meters. The wire should be replaced immediately if it is wet or broken.

5. When the welding wire passes through the road, it must be elevated or buried in the protective tube and buried underground. For example, when passing through the track, it must pass under the track.

6. The primary and secondary wiring of the AC welding machine should be accurate and the input current should meet the equipment requirements. Do not touch the live parts of the primary line.

7. The secondary tap connection copper plate must be compacted, and the terminal post should have a coil. Check in detail that the contact bolts and other components should not be loose or damaged before closing.

Matters needing attention in welding

1. According to the technical conditions of the work, a reasonable welding process should be selected, no overloading is allowed, welding with high current is not allowed, and metal welding operations with electric welding machines are not allowed.

2. During load welding, the temperature rise of the welder should not exceed 60 degrees A, 80 degrees B, otherwise the welding should be stopped after cooling down.

3 The welding machine should be kept dry and well ventilated. When moving the welding machine, the power supply should be cut off, and the welding machine must not be moved by dragging the power supply. If there is a sudden power failure during welding, turn off the power.

4 It is not allowed to adjust the current during welding. Must be adjusted with the adjustment handle when welding is stopped, not too fast or too fast, so as not to damage the regulator.

5. It is forbidden to do welding work under the crane running workpiece.

6. If welding is performed in the area where there is a crane wire rope, care should be taken not to make the ground wire of the welding machine accidentally touch the hoisted wire rope, so as to avoid sparks and accidents.

7. When working in a wet area, the welder must work on an insulated wooden board, not allowed to touch the welder wires, and not allowed to hold the welding clamp with an arm.

Three, matters needing attention after welding

1. After the welding operation is completed, the power should be cut off immediately, the welding machine switch should be turned off, and the power and ground wire of the welding clamp should be cleaned and rectified separately to avoid short circuit caused by closing.

2. If the automatic stop device is found to be invalid during welding, it should be shut down immediately for power failure and maintenance.

3 Wear glasses when removing weld slag. Pay attention to the direction of the head to avoid the slag splashing to avoid injury. Welding slag must not be blasted at the people present.

4 After the open-air operation is completed, the welding machine should be covered to prevent rain.

5. When welding is not performed (moving, repairing, adjusting, rest during work), the power should be cut off to avoid accidents.

6. Check the grounding of the welding machine once a month.

Welding aids include ultraviolet, infrared or other protection from the operator from welding arcs or other welding energy sources

I. Energy-efficient

The energy saving of electric welding machine is reflected in energy saving under no load and energy saving under load. No-load welding machine can put the main circuit, fan, etc. into a stopped state, and the no-load power consumption is only a few watts; the efficiency of the welding machine is higher than that of thyristor rectifier welding machine. According to statistics of relevant parameters, the demand for DC welding machines in the national welding industry in 2008 was 890,000 units. If all DC welding machines are used, it can directly save 43,000 tons of copper, 64,000 tons of steel, and 680 million KW.H of electricity Indirectly saved 565,500 tons of coal, 10.34 million tons of water, and reduced 1,145,400 tons of CO2 emissions. It can be seen that vigorous promotion of DC welding machines has huge economic and social benefits.

2. Stable welding performance

Because the welding machine's working frequency is above 20KHZ, it has a fast response speed, and it can control the subdivision of the droplet transfer into multiple stages. For CO2 gas shielded welding, the spatter can be greatly reduced, and the stability of the jet transition can be effectively controlled for the pulse melting pole MIG / MAG welding, and the droplet transfer and the movement of the wire feeding mechanism can be combined to further control the melting During the transition process, a good weld seam is formed and the welding performance is stable. These are not possible with traditional rectifier welding machines.

Three. Achieve centralized control

Digital welding controllers such as single chip microcomputers, DSPs, FPGAs are widely used in electric welding machines, and network communication between multiple welding machines or host computers and welding machines is realized through Ethernet and field bus. It not only solves the problem of cooperative operation of multiple welding machines and facilitates centralized control in the welding process, but also realizes the setting or monitoring of remote welding machine parameters, making remote fault diagnosis and maintenance of the welding machine possible.

The electric welding machine industry is a small industry, but the product involves multiple disciplines and marginal disciplines. It is intensively intersecting with many disciplines such as machinery, electronics, mechanics, control, metallurgy, materials, and computers. It also depends to a large extent on the maturity of other industries. And progress, such as insulating materials, electromagnetic materials, power electronic devices, computer technology, etc. Limited by many factors such as technical foundation and capital, it is difficult for China's electric welding machine industry to achieve sustainable and leapfrog development by relying solely on its own capital and strength, or on imported materials and components to achieve rapid product development and rapid development. Great. This phenomenon actually reflects that the development of the welding machine industry is bound to be limited by China's overall scientific and technological strength, and the development of application-oriented industries cannot be separated from the progress of the national basic industry.
China has become the world's largest manufacturer of electric welding machines. The market capacity of electric welding machines has ended at a rapid development stage and entered a relatively stable development cycle. According to relevant data: from January to May 2012, the national production of electric welding machines reached 1.566 million Taiwan, an increase of 5.52% year-on-year. In May, China produced 344,000 electric welding machines, a year-on-year increase of 0.65%.
From the perspective of the output of various provinces and cities, from January to May 2012, the top three provinces and cities in China's electric welding machine production were Zhejiang Province, Guangdong Province, and Shanghai, accounting for 36.90%, 27.49%, and 19.38% of the total output, respectively.

Reasonable design and free adjustment. Different discharge frequencies can be selected according to different metal materials to achieve the best repair effect.

The heat affected area is small. There is no heat input during the instant of stacking, so there is no deformation, undercuts and residual stress. No local annealing occurs and no reheating is required after repair.

Minimum welding repair impact. This welding machine overcomes the impact of ordinary argon arc welding on the periphery of the workpiece during the welding repair process. It is also possible to repair the machined surface of the workpiece without any margin.

High precision of repair: The thickness of the overlay welding is from a few microns to a few millimeters, and only grinding and polishing are needed.

High welding strength: Due to sufficient penetration of the material on the surface of the workpiece, a strong bonding force is generated.

Using ring precision control.