What is the difference between pulse DC welding machine and inverter argon arc DC welding machine?

Pulse DC welding machine, also known as pulse argon arc welding machine, is mainly used for high-quality, high-demand welding, generally used for thin plate welding, the workpiece deformation is relatively small, when working, there are two current states, namely peak current and low value current, which can adjust the alternating frequency and working cycle of the two currents respectively, and now it is generally an inverter-type pulse argon arc welding machine.

Inverter argon arc DC welding machine is the basic state of pulse argon arc welding machine, when working, there is only one constant welding current, the above two kinds of welding machines generally have a slow rise time and a slow fall time, the slow rise time refers to the arc starting, the welding current rises from the minimum current to the time of the set welding current, and then enters the constant welding current of the setting welding current, when the arc is closed, the current gradually decreases from the set welding current to the minimum current time, which is the slow down time, and then stop welding.

The pulse DC welding machine has a pulse when welding, therefore: the pulse is the size of the frequency and the size of the time when the welding machine is welding, and the current is large, small, fast and slow.

The argon arc DC welding machine is what the current you set when welding, and how much is it when welding. It depends on the potentiometer that adjusts the welding machine by yourself.

The inverter welding machine is through the input of alternating current, rectifying into high-voltage direct current, and then filtering, inverting into high-voltage alternating current, rectifying again, and the reactor output into smooth direct current.

Including electrode hand arc welding machine, plasma cutting machine (welding machine), argon arc welding machine, carbon arc gouging, submerged arc welding machine, etc.

Argon arc welding machine is argon shielded arc welding, including non-melting electrode (tungsten electrode), melting electrode.

These are two concepts.

DC welding machine and AC welding machine are both welded by short-circuit arc, but DC welding is more stable and used in demanding occasions:

First, the current output of the DC welding machine does not have a "zero crossing point", it is not easy to break the arc, and the arc is stable, which is its biggest advantage.

Second, the peak value of the secondary voltage of the transformer is certain, and the no-load voltage of the DC welding machine is higher than that of the AC welding machine, which is easier to trigger the arc.

Third, the DC welding machine has more rectifier parts than the AC welding machine, and the cost is slightly higher.

Fourth, the high-power AC welding machine can only use two-phase electricity at most, so it is easy to cause three-phase electricity imbalance, while the high-power DC welding machine uses three-phase rectification without this problem.

Fifth, the use of welding rods is related to welding materials and has nothing to do with welding machines.

The purpose of the electric welding machine is to use the high-temperature arc generated by the positive and negative electrodes in an instantaneous short circuit to melt the solder and the welded material on the electrode, so that the contact object is combined. Its structure is very simple, it is a high-power transformer. Welding machines can generally be divided into two types according to the type of output power supply, one is AC power supply and the other is direct current.

They use the principle of inductance, the amount of inductance will produce a huge voltage change when it is turned on and off, and the high-voltage arc generated by the positive and negative poles in the instantaneous short circuit is used to melt the solder on the electrode to make them achieve the purpose of atomic bonding.

Compared to AC power sources, DC power supplies provide a stable arc and smooth melt droplet transition. - Once the arc is ignited, the DC arc can maintain continuous combustion; When using AC power for welding, due to the change of current and voltage direction, and the arc has to be extinguished and re-ignited 120 times per second, the arc cannot be continuously and stably burned. In the case of low welding current, the DC arc has a good wetting effect on the molten weld metal, and can standardize the weld bead size, so it is very suitable for welding thin parts.

DC power supply is more suitable for vertical welding and vertical welding than AC power supply because the DC arc is shorter.

However, sometimes the arc blowing of the DC power supply is a prominent problem, and the solution is to convert to the AC power supply. For AC and DC electrodes designed for AC or DC power welding, the vast majority of welding applications under DC power conditions are better. In manual arc welding, the AC welding machine and some of its additional devices are inexpensive, which can avoid the harmful effects of arc blowing force as much as possible.

However, in addition to the lower cost of the equipment, the effect of welding with AC power is not as good as that of DC power supply.

The arc welding power supply (CC) with steep drop characteristics is best suited for manual arc welding. The change in voltage corresponding to the change in current indicates that the current gradually decreases as the arc length increases. This characteristic limits the maximum value of the arc current, even if the welder controls the size of the weld pool.

As the welder moves the electrode along the weldment, it is inevitable that the arc length will change constantly, and the arc welding power source with steep drop characteristics ensures the stability of the arc during these changes.

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What are the characteristics of AC welding machine and DC welding? Today is a long time to see.

DC welding machine and AC welding machine both rely on short-circuit arc to weld, and the effect is the same, that is, the shape of the welding is different.

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1。The AC welding machine is relatively large in size and has large power loss, but the power is strong and cheap, and its structure is the transformer principle.

2。The DC welding machine is small in size and low in power loss, but the nominal power is insufficient and needs to be high, and its principle is the switching power supply.

The effect is the same, but the shape of the weld is different.

There are no edges, and the effect is the same.

The effect of the problem of the welded figure is the same.

The mass of dark matter is immeasurable.

It's a matter of electricity, and there's also a problem of soldering out the graphics.

The biggest difference between an inverter welding machine and a DC welding machine is the different way of outputting current.

1. The model of the DC welding machine is good AC welding machine starts with bx, and the internal structure is a super-large power frequency transformer. It is a high-energy-consuming product that is forcibly eliminated by the state. The model of DC welding machine generally starts with zx, and there are often zx5 and zx7

At present, the mainstream DC welding machine is ZX7 inverter DC welding machine.

2. Inverter arc welding power supply, also known as arc welding inverter, is a new type of welding power supply. This kind of power supply is generally the three-phase power frequency (50Hz) AC network voltage, first rectified and filtered by the input rectifier, into DC, and then through the alternating switching of high-power switching electronic components (thyristor SCR, transistor GTR, MOSFET MOSFET or IGBT), inverted into a few kHz tens of kHz of the intermediate frequency AC voltage, at the same time through the transformer to a voltage of tens of V suitable for welding, and then rectified again and through the reactance filter output a fairly stable DC welding current.

3. The inverter welding machine has a good welding effect, the main difference is in terms of weight, the weight is one-third of the AC welding machine or even lighter, easy to move, and suitable for the needs of the times. When welding, the inverter welding machine has the function of thermal arc starting, which is more convenient for arc starting, and the power consumption of the AC welding machine is much larger than that of the DC welding machine, so power saving is a major feature of the DC welding machine.

What we originally said about the DC welding machine, the common ones are the following varieties:

1: Use a three-phase asynchronous motor to drive a DC generator to rotate, then, use the DC power generated for welding, the disadvantage, too bulky, extremely inconvenient to move. The noise is high, the generator commutator is worn normally, and it is very expensive.

2: Tap transformer, output terminated rectifier, also large size, large weight.

3: Moving coil DC welding machine is also large in volume and weight.

4: Thyristor DC welders are also large in volume and weight, because they have a main transformer that converts the voltage and efficiency.

Low, high loss.

The original working mode of the inverter welding machine is completely changed, and the inverter technology is to change the power frequency (50Hz) alternating current, first through the rectifier rectification and filtering into DC, and then through the high-power switching electronic components (thyristor SCR, transistor GTR, MOSFET MOSFET or IGBT), inverted into a few kHz tens of kHz of medium frequency alternating current, at the same time through the transformer to a voltage of tens of V suitable for welding, rectified again and through reactance filtering output a fairly stable DC welding current.

The order of transformation can be simply expressed as:

Power frequency AC (rectified filter) DC (inverted) Medium frequency AC (step-down, rectification, filtering) DC.

That is: ac dc ac dc

The basic feature of arc welding inverters is their high operating frequency, which brings many advantages.

Because the transformer, whether it is the primary winding or the secondary winding, its potential e is related to the frequency f of the current, the magnetic flux density b, the cross-sectional area of the core s and the turns w of the winding as follows

e = while the terminal voltage u of the winding is approximately equal to e, i.e. .

U e = When U and B are determined, if F is increased, S decreases and W decreases, so the weight and volume of the transformer can be greatly reduced.

The weight and volume of the whole machine can be significantly reduced.

There are also many advantages due to the increase of frequency and other factors, compared with the traditional arc welding power supply, its main features are as follows:

1.Small size, light weight, saving materials, easy to carry and move.

2.High efficiency and energy saving, the efficiency can reach 80% 90%, and it saves more than 1 3 more than traditional welding machines.

3.The dynamic characteristics are good, the arc is easy to start, the arc is stable, the weld is beautiful, and the spatter is small.

4.It is suitable for combining with robots to form an automatic welding production system.

5.It can be used for multiple purposes and complete a variety of welding and cutting processes.

Generally, the DC inverter welding machine is to meet the requirements of the dynamic and static characteristics of the welding process. First of all, it is necessary to choose the appropriate welding power source (DC output 400A is recommended). Then it's time to design a reliable circuit structure.

IGBT can be used as a power electronic device to form a single-ended forward inverter main circuit, and the low-power IGBT parallel type and two-way inverter arc welding power supply can be used in parallel to meet the requirements of large-capacity output. The control circuit of the system uses pulse-width modulation technology (PWM) and the PWM modulator adopts the typical integrated circuit SG3525. The working characteristics of the system are as follows: when the welding arc is working normally, the PWM control mode is adopted, the inverter frequency is set to 20kHz, and the constant current external characteristics are controlled; The system uses voltage feedback control to make the PWM modulator output pulses intermittently when there is no load, and the frequency of intermittent oscillation is low and the pulse width is narrow, which not only has small no-load loss, but also makes the transformer not easy to saturate.

The system adopts the control mode of short-circuit frequency division for the short-circuit process of the welding arc, and controls the short-circuit current. The system also adopts a small given value and a minimum pulse width control circuit, which makes the welding easy to start arcing, the welding arc is stable, and the welding characteristics are good.

Hello! The difference between the two is that the pulse DC welding machine is also called the pulse argon arc welding machine, which is mainly used for high-quality, high-demand welding, used for thin plate welding, the deformation of the workpiece is relatively small, and when working, there are two current states in the hole, that is, the peak current and the low-value current, which can adjust the alternating frequency and working cycle of the two currents respectively. The inverter argon arc welding machine is a machine that uses argon as the shielding gas and tungsten electrode as the non-melting electrode, and heats the molten base metal (and the welding wire is also melted at the same time) with the help of the arc generated between the tungsten electrode and the weldment.

It is suitable for carbon steel, alloy steel, stainless steel, refractory metal aluminum and aluminum-magnesium alloy, copper and copper alloy, titanium and titanium alloy, as well as ultra-thin plate, and can be welded in all directions, especially for complex weldments that are difficult to access, etc. The inverter TIG DC welding machine is the basic state of the pulse TIG welding machine, and when working, there is only one constant welding current. The above two kinds of welding machines generally have a slow rise time and a slow fall time, the slow rise time refers to the time when the arc starts, the welding current rises from the minimum current to the time when the welding current is set, and then enters the constant welding current of the setting welding current, and when the arc is closed, the current gradually decreases from the set welding current to the minimum current time, which is the time of slow decline of the bending bend, and then stop welding.