Analysis of common faults of CO2 welding machine, common faults of Erbao welding machine

Analysis of common failure causes of CO2 welding machine:

For example, fault phenomenon: welding for a while, the abnormal indicator light is on.

Cause of failure: (1) Thermal relay failure. (2) Overload persistence rate use. (3) The cooling fan does not rotate.

Exclusion method: 1) Use a thermometer to measure the temperature rise of the radiator of the flat reactance and the thyristor module, check the two temperature relays with a multimeter under normal conditions, and confirm which temperature relay works when the fault occurs, and the resistance between the two leads of the relay is zero under normal times. If this value is not the case, the temperature relay is faulty and should be replaced.

2) Use within a limited range of load duration. (3) Check the fan and capacitor, and replace it in time if there is a fault.

For example, the value displayed by the ammeter does not match the actual current.

Cause of failure: (1) The wiring bolts of the two output terminals of the welding machine are loose. (2) The output ground wire is not in good contact with the base metal. (3) The CT of the current transformer in the welding machine is damaged. (4) The P board is faulty.

Exclusion method: 1) Tighten the wiring bolts of the two output terminals.

2) Make the contact between the output ground wire and the base metal reliable.

3) Replace the current transformer CT.

4) Replace the P-plate.

1.No wire feeding: the wire feeding circuit is faulty, if it is split, whether the control cable is broken;

2.Unstable welding current: the input voltage is unstable, the current adjustment knob is broken, and the control circuit is faulty;

3.The welding wire does not melt: there is a lack of phase, the thyristor or coil or power module is bad (I don't know which model you are talking about);

4.The current adjustment is not large (small): the adjustment knob is broken, the control circuit is faulty, and the control cable is broken.

Cracks in the weld metal.

1.The weld depth-to-width ratio is too large2The weld bead is too narrow3The end of the weld cools quickly 1Increase the welding arc voltage and reduce the welding current2Slow down the welding speed 3Fill the crater appropriately.

Inclusions 1Multi-pass welding short-circuit arc 2High walking speed 1Carefully clean the slag shell 2Reduce the walking speed and increase the arc voltage.

Stomata 1Shielding gas coverage is less than 2Welding wire contamination 3

Workpiece contamination 4The arc voltage is too high5The nozzle is too far away from the workpiece 1

Increase the gas flow, remove the splash in the nozzle, and reduce the distance from the workpiece to the nozzle2Remove the lubricant from the welding wire3Remove oil rust and other debris from the workpiece.

4.Reduce the voltage by 5Reduce the extension length of the wire.

Undercut 1The welding speed is too high2The arc voltage is too high3

The current is too high4The dwell time is less than 5Incorrect torch angle 1

Slow down the welding speed 2Reduce the voltage by 3Reduce the welding speed by 4

Increase residence time at the edge of the melt pool5Change the angle of the torch so that the arc force pushes the metal to flow.

Unfused 1There are oxide scales and rust in the weld area2The heat input is less than 3

The weld pool is too largeWelding technology is not high5Unreasonable joint design 1

Carefully clean the oxide scale and rust 2Increase the wire feeding speed and arc voltage, and slow down the welding speed3When using the oscillating technique, it should stay at the edge close to the bevel face, and the wire should point to the leading edge of the weld pool4

The bevel angle should be large enough to reduce the length of the wire extension so that the arc heats directly to the bottom of the melt pool.

1Bevel processing is not suitable 2Welding technology is not high3

The heat input is not suitable 1Increase the bevel angle, reduce the size of the blunt edge, and increase the gap by 2Adjust the walking angle3

Increase the speed of wire feeding to obtain a large welding current, and keep the distance between the nozzle and the workpiece appropriate.

Splash 1The voltage is too low or too high2Poor cleaning of welding wire and workpiece3

The welding wire is uneven 4Contact tip wear5The welding maneuver characteristics are not suitable 1

Voltage regulation according to current 2Clean the welding wire and groove 3Check the wire feed wheel and wire feed hose 4

Update contact tip 5Adjust the DC inductance.

Serpentine weld beads. 1.The welding wire sticks out too long2Poor adjustment of the correction mechanism of the welding wire 3Contact tip wear 1The length of the welding wire is 2Adjustment of the correction mechanism 3Update the contact tips.

1. The reason for the voltage instability of the general contactor 2The wire feed is unstable. The wire feeding core is broken, and the speed regulation part 3 air outlet CO2 is impure 4There is no dynamic and static switch or broken control line inside the welding machine.

5. Check the control line, turn it on or replace it.

10. The output cable connector falls off.

18. Replace high-quality welding wire. Fasten.

The knowledge base has been moved over for you.

Replacement of wearing parts, contact tips, wire feeding hoses, wire feed wheels.

Clean the path through which the wire passes.

The control line from the wire feeder to the welder.

Inside the machine, solenoid valves, AC contactors.

Summary. Hello dear, the power supply is normal, that is, the no-load voltage on the welding machine is, the current is normal and adjustable, that is, it does not burn 1, there is no voltage input at the input end of the welding machine; 2. The internal wiring falls off or is broken; 3. The internal coil burns out. Workaround:

1. Check whether the switch, wire and fuse from the distribution box to the input end of the welding machine are in good condition; 2. Check whether the wiring of the internal switch and coil of the welding machine is in good condition; 3. Replace the burned coil. You can rule out these reasons, I hope it can help you.

Hello, I have seen your question, and I am sorting out the answer, please wait for a while Hello dear, carbon dioxide gas shielded welding machine has no voltage fault, first check whether there is a problem with the power supply or the voltage is unstable. Check the fuse in the welder, whether the switch is damaged. Check whether the control panel in the machine is not in good contact.

Hope it can help you. If my answer to the number of jujube is helpful to you, please also give a thumbs up (comment in the lower left corner), look forward to your like, your efforts are very important to me, and your support is also the driving force for my progress. After the last paragraph, I wish you good health and a happy mood!

If the power supply is normal, the no-load voltage on the welding machine is, and the current is normal and adjustable, that is, it does not burn.

Hello dear, the power supply is normal, that is, the no-load voltage on the welding machine is, the current is normal and adjustable, that is, it does not burn 1, there is no voltage input at the input end of the welding machine; 2. The internal wiring falls off or is broken; 3. The internal coil burns out. Solution: 1. Check whether the switch, wire and stool lead fuse from the distribution box to the input end of the welding machine are in good condition; 2. Check whether the wiring of the internal switch and coil of the welding machine is intact; 3. Replace the burned coil.

Summary. 1.The gas cylinder switch should be unscrewed to ensure that the gas is normal**. It's not good to open a small one.

2.If the gas is turned on enough, check whether the trachea is bent and affects the gas supply.

3.It is normal to see if the gas is running out and the cylinder pressure is low. The trachea is damaged and carbon dioxide enters the air.

Finally, check the solenoid valve.

What is the reason for the unstable air supply during the welding of the CO2 welder?

1.The gas cylinder should be unscrewed to ensure the normal gas **. It's not good to open a small one.

2.If the gas is turned on enough, check whether the trachea is bent and affects the gas supply. 3.

It is normal to see if the gas is almost used up and the gas pressure of the cylinder is low. The trachea is damaged and carbon dioxide enters the air. Finally, check the solenoid valve.

Sell skins. Hope it helps!

What is the reason why the CO2 gas shielded welder has no output current and how to solve it?

Hello dear, happy to solve the problem for you, <>

What is the reason why the CO2 gas shielded welder does not output beam excitation current and how to solve it? Answer: First check whether there is a problem with the power supply or the voltage is unstable.

Check whether the fuse and switch in the welding machine are damaged Check whether the control panel in the machine is in contact with the slag. The welder is overload protected. Second, the welding machine is due to:

The welding voltage is high + the welding current is large, and the long-term continuous operation exceeds the rated output load rate of the welding, the welding machine is protected, at this time there is no welding voltage The output of the welding current, only the rear panel fan of the welding machine continues to run, please do not turn off the welding machine, and wait for the wind and limb fan to cool down to the normal temperature, the welding machine will resume the welding voltage and current output. The temperature is high, and the heat dissipation capacity of the welding machine is reduced, which will cause the welding machine to overheat protection. The welding machine needs to be blown with compressed air at least twice a month, and the frequency of dust blowing needs to be increased in a dusty environment, otherwise the dust will cover the parts of the welding machine, which will also affect the heat dissipation and cause thermal protection.

The welding machine lacks phase, a three-phase live wire is short-circuited, and the single-phase 380V welding machine also has no welding parameter output.

Summary. The voltage of the carbon dioxide welder is normal, what is the reason for the poor welding? There are several reasons why it cannot be welded

1: Poor contact between the ground wire and the workpiece. 2：

The electrode (wire) is wet. 3: The welding current and other parameters are too small, and the welding rod (welding wire) cannot be melted.

Solution: Wait for the grid voltage to return to the rated value before use; According to the rated input current of the welding machine, it is equipped with a wire with sufficient cross-sectional area; Increase the cross-sectional area of the welded cable or reduce the length of the welded cable, generally not more than 15m;

The voltage of the carbon dioxide welder is normal, what is the reason for the poor welding?

The voltage of the carbon dioxide welding machine is normal, what is the reason for the poor welding? The reasons for not being able to weld are:1:

The ground wire is in poor contact with the workpiece. 2: The electrode (welding wire) is damp.

3: The welding current and other parameters are too small, and the welding rod (welding wire) cannot be melted. Solution:

Wait for the grid voltage to return to the rated value before use; According to the rated input and carrying current of the welding machine, it is equipped with a wire with sufficient cross-sectional auspicious product; Increase the cross-sectional area of the welded cable or reduce the length of the welded cable, generally not more than 15m;

The power cord was brought with the welding machine when I bought it? Can't it be fine?

215 welding machine trim power cord 1, even if the thinnest welding rod and the smallest current are used, the lowest welding machine must use the national standard cable A square millimeter and the following welding machine, the input line is not less than 4 square millimeters. The input line of 315A-630A is not less than 6 square millimeters5 square millimeters of copper and filial piety core wire can pass 13 amperes of current under normal conditions, and its safe current is, no matter what, it is impossible to meet the current requirements of the welding machine.

The input power supply voltage is 390 volts, the three-phase bridge is excitedly balanced, and the current welding is also balanced.

The voltage of the transformer's 10,000-hand volt power supply system is not very stable, and the same will change with the power consumption of the bucket, so the increase in the voltage of 10,000 volts will also increase the three-phase power supply.

When I measure the voltage is 390 volts, can't I connect it?

No, dear.

How much should that be?

1: The ground wire and the workpiece are not in good contact with the excavation brigade. 2：

The electrode (wire) is wet. 3: The welding current and other parameters are too small, and the welding rod (welding wire) cannot be melted.

Solution: Judge the bench to be used after the grid voltage is restored to the rated value; According to the rated input current of the welding machine, it is equipped with a wire with sufficient cross-sectional area; Increase the cross-sectional area of the welded cable or reduce the length of the welded cable, generally not more than 15m;

Summary. Hello, it is possible that the welding method is not right, resulting in gas blockage somewhere, so in the welding, sometimes dense porosity suddenly appears Seemingly no gas protection, the welding posture should be adjusted in time to correct the position of the welding gun. First of all, it is related to the purity of carbon dioxide gas, the regulation of current and voltage, and the welding technology.

The voltage of the carbon dioxide welder is normal, what is the reason for the poor welding?

Hello, it is possible that the welding method is not the right lead sail, resulting in gas blockage somewhere, so in the welding, sometimes there are dense pores in the hail, and there seems to be no gas protection, and the welding posture should be adjusted in time to correct the position of the welding gun. First of all, it is related to the purity of carbon dioxide gas excitation, the regulation of current and voltage, and the welding technology.

1.The base material is unclean. 2.The wire is rusty or the flux is wet. 3.Poor spot welding, improper selection of welding wire.