Spot welding control panel instead of time relay, regulating time current transformer, spot welding control panel

Description

Purchase control panel, send matching dial set, wiring terminal 2!

Control panel features

1, size 77mm x 50mm, large board, compatible with 41A and 100A SCR

2, can adjust the spot welding time and spot welding current, range 0.02-1s, current 40-100, positive left button adjust time, right knob adjust current. For safety reasons, adjust the current knob for customization

Plastic handle potentiometer

This potentiometer, torque.

3, the foot switch wiring is isolated from the city electricity, even if the touch is safe

4, foot switch down, no matter how long the time can only spot welding once, the second spot welding needs to loosen, re treads

5, to increase the anti shake circuit, to prevent the foot switch down when the switch contact jitter caused by mistake spot welding

6,

control board will be replaced with a bright LED indicator, turn on the red light, and when the light is green, this is normal

Please buyers know

7, our main components are imported components, not cheap domestic components, to ensure that the performance of the board more stable

8, our company uses large core components, not cheap, small core.

9, the board is too large, tin processing at the current, to ensure output

10, made into spot welder after use, does not affect the home, city electricity.

The thyristor on the control board is 41A, and can only be used in a single microwave transformer. The double transformer will cause excessive flow damage. The primary full load current shall be below 20A, and the maximum shall not exceed 25A.

Want to use dual transformers, the primary current is greater, the use of 100A SCR control panel. It is suggested that the maximum primary current should not exceed 40

A.

For what is the maximum pass current, the specific reasons are explained later!

Although many friends make it easy, I can't guarantee success for everyone. DIY failure is normal. I will send the board before transformer field testing, and strive to improve the success rate of making friends, but can not guarantee that every friend connected with the control panel are normal, can not guarantee the ideal spot welding production. Buy a board to be able to accept the failure of the ideological preparation, do not accept, say, just a few points on the test board is broken, and require return, after all, the board price is very low, and the courier fee is not low. Board is sold without warranty.

Time relay and AC contactor scheme has the following obvious shortcomings: one is the wiring, wiring complex, the forum there are many advisory connection message; two is the time relay and AC contactor high price, lead to cost more; three is large, is not conducive to miniaturization; four is a big noise, pull the sound relay pops the big night is more obvious.

The board requires 9V transformer power supply shop need another photo, a few friends with their 12V powered unstable imagination! Therefore, the shopkeeper strongly recommended that all friends use the purchase of the 9V transformer. We are not responsible for any problems with the use of other power supplies. The transformer is not necessarily different from the batch as shown

Nameplate

Mind who do not shoot

In the use of two-way thyristor, in addition to ordinary SCR should pay attention to the problem, but also need to pay attention to the following points. for electronic enthusiasts to read for reference

1, the bidirectional thyristor is usually rated voltage, conduction current, trigger current, leakage current and voltage drop parameters, of which the first two in the application of the most important. For example, the control of lighting, lighting is not bright because the filament resistance is very small, light moment, impulse current to want 10, 20 times bigger than the current normal working hours, there is sufficient margin once chosen without pipe parameters, it is possible to make the big current impact and damage.

2. The average current given by the common thyristor in the parameter list or certificate is the average value, while the rated current given by the bidirectional thyristor is the effective value. Therefore, in the use of two-way thyristor instead of two parallel reverse common SCR, must be converted to select qualified components. The formula for conversion is IT=0.45IKs. Type: IT – ordinary SCR rated current safety; IKS – triac, rated current < <. For example, a bidirectional thyristor with an rated current of 500 is used as a bidirectional switch, which is equivalent to two ordinary silicon controlled rectifier with the number of current rating values,

IT=0.45×500 ANN =225 ANN

From an ordinary thyristor parameter series, the approximate value is 200, ann. Therefore, when the rated current is 500, the bidirectional thyristor can replace the ordinary silicon controlled rectifier with the current rating of 200 when used as an AC two-way switch.

3, the actual use, in the choice of triac triggering circuit, on the one hand should try to use more easily trigger the trigger trigger signal, on the other hand should trigger the signal voltage and current as high as possible and larger The The trigger current should normally be about twice as large as the Ic value found in the manual.
4, select the two-way thyristor, should choose the rated current value is greater than the load current RMS triac. For capacitive loads should also pay attention to over current protection.
5, for inductive load, it should be noted that the voltage rise rate is less than the du value given in the manual, otherwise there will be out of control phenomenon. To solve this problem, the RC electrode can be parallel in the RC circuit, the value of resistance R can be selected in about 100 ohms, the capacity of the capacitor C can be used for about 0.1 emblem.
6, pay attention to heat problems. Two-way thyristor and ordinary transistors, like a great impact on the temperature, the temperature is too high will be prone to malfunction, or even burn the device. Installation should be installed enough large radiator; in practical application to pay attention to the problem.
7, when the maintenance of electrical appliances need to buy a new two-way thyristor to replace has been damaged, in advance should be based on the power of the load to verify the original tube pressure and rated conduction current, and determine the polarity of the new device electrode Consistent with the original.

Do a friend of the welder Please read the following carefully!
  Spot welding principle
 

AC spot welding machine is the use of transformers will 220V industrial spot welding machine generally use 380V AC conversion to a lower voltage, lead through the electrode lead to the spot welding electrode, the use of electrode short circuit electrode contacts and weldment is very low Of the contact resistance, tentatively called the short circuit generated by the moment of high current ablation welds to produce nuggets to achieve the purpose of welding. Spot welding when the high current is the key to spot welding, the production of spot welding should be able to produce large current as the main line, followed by the majority of users feel trouble the length of the spot welding control.
         1. Transformer selection is critical.
 

Spot welding is a large current welding, welding power consumption is also great, spot welding battery thin nickel belt when the power is 2KW, which requires a large output power transformer, with a small transformer is difficult to succeed. Integrated transformer size, restructuring costs and restructuring workload considerations, the proposed use of microwave transformers, it is sufficient to meet the occasional spot welding in the day.
 

2. Select the appropriate time and switch control mode.
 

Industrial use of the spot welding machine is almost without exception, the use of control thyristor conduction angle and conduction time to control the spot welding current strength and time, and can be precisely controlled to a single pulse, online DIY spot welding machine Most of the time is to use the relay to control the way the AC contactor, this approach too many shortcomings, do not recommend the use of this approach, the proposed use of thyristor.
 

3. Correctly know the spot welding current and time.
 

Spot welding when the solder joint temperature is high, will cause the solder near the metal oxidation, thus affecting the solder joint strength and material properties, the longer the spot welding the more serious oxidation, so the appropriate welding method is as short as possible under short current time, Spot welding time is generally not more than 0.5 seconds. Industrial spot welding machine current output capacity is very large, so according to different thickness of the welding consumables to choose the appropriate current to prevent the solder paste, splash. Microwave oven transformer to change the spot welding current output capacity is generally limited, the general function of the current should be set in the maximum current, to explore the maximum current under the shortest welding time; transformer secondary and welding line thick, then the secondary current Relatively large, then the current should be transferred to the spot when the spot welding is not obvious discoloration as well. Some users due to the selection of the transformer is not appropriate or secondary line smaller lead output current is small, spot welding difficult to extend the spot welding time to make up, I do not advocate this, or should work hard from the transformer.
 

4. The relationship between spot welding voltage and spot welding effect.
 

Spot welding is a high current melting, is the current impact of spot welding effect, as long as the spot welding current is enough on the line, and spot welding voltage is not directly related, but the spot welding secondary circuit resistance but affect the maximum spot welding current. The resistance in the spot welding circuit has the contact resistance of the contact part, the spot welding electrode, the welding lead wire and the secondary winding resistance. If the total resistance in the spot welding circuit is large, it is necessary to achieve the ideal spot welding current Level voltage, but the increase in the loss of the circuit, the performance of the heat from the obvious, the efficiency is reduced; if the circuit resistance is smaller on the secondary can use a lower voltage, so the heat is not obvious, high efficiency, so large-scale industry Spot welding of the secondary cross-sectional area is very large, very thick electrode lead, secondary voltage is relatively low, and some only 2V. Most of the enthusiasts in the DIY spot welding when the secondary found around 4 laps voltage slightly lower than 4V when the spot welding effect is not ideal, increase the lap to increase the voltage after the spot welding effect will be good, and mistakenly think that the secondary voltage Good, in fact, his transformer secondary line cross-sectional area is not enough or the electrode lead wire is too small reason, the ideal spot welding machine is the secondary voltage can be produced at a lower voltage enough to increase the secondary voltage will bring To the welding line and secondary serious fever of the shortcomings.
 

5. Have a psychological preparation for welding heat.
 

Spot welding when the energy is very high, the solder joint temperature is very high, welding electrode and welding fixture is copper, heat quickly, continuous spot welding welding parts of the heat is very obvious, and even hot, high current welding Lead and secondary coil heating is also very obvious, the transformer is in the overload state, the primary coil and the core heat is also fast, so a single microwave oven to do a small spot welding machine is not qualified for a long time continuous spot welding, which heat The most obvious is the welding site, will be hot to hold you forcing you to stop. Because the welding parts will be hot to the first can not be used, so the internal parts of the spot welding machine do not need to force the heat; spot welding control panel on the SCR light the most light, so I designed the control panel SCR does not add heat sink.
 

If you want a long time continuous spot welding, you must consider the heat of the components forced cooling, welding parts of the general water cooling, welding lead cross-sectional area to be large, but also need to pass through the water, the control panel SCR Switch to a larger current module and reliable cooling, the main transformer have to heat, of course, a microwave transformer can not be competent, so down trouble is not small, the cost is not low, which is the industrial high point welding machine high price reasons.
 

6. Spot welding electrode on the spot welding effect of a great impact.
 

Electrode is an important part of the welding circuit, it conveys the welding area to the current and pressure, to distort the surface of the weldment and welding part of the heat, and the workpiece positioning, clamping in place, the working end and adjacent areas will bear Large current density, compressive stress and temperature gradient, working conditions are very harsh. Electrode selection is often not the attention of enthusiasts, practice has proved that ordinary materials in the copper pure copper can barely use, brass, aluminum can not be used, often used, or buy a special welding electrode, spot welding stainless steel You can use chrome zirconium copper, spot welding nickel plate is best to use alumina copper, spot welding pieces need tungsten molybdenum electrode. Specific options can Baidu look, the Internet has a more detailed description.
 

7. Welding electrode pressure affect the spot welding effect.
 

Spot welding to the need to apply the appropriate pressure welding, reducing the tip of the electrode and the weldment, welding between the contact resistance, increase the welding current, improve the welding effect. The pressure is too small will produce splash, burn thin welding consumables, solder joints difficult to form an effective nugget; pressure caused by the joints at the junction and accelerated welding ablation. Industrial spot welding is the use of pneumatic pressure, the pressure size is better control, personal use is a manual use of the feeling, to spot welding less splash, solder joints are not recessed for the ideal state, need to hands-on experience.