Why does virtual soldering occur in electric welding, and what does virtual soldering mean in circui

The main reasons for this are:

1. Poor solder quality.

2. Reducibility of flux.

Poor or insufficient dosage.

3. The surface of the welded place is not cleaned in advance, and the tinning is not firm.

4. a soldering iron tip.

The temperature is too high or too low, and there is an oxide layer on the surface.

5. The welding time is too long or too short, and it is not well mastered.

6. When the solder has not solidified during soldering, the soldering components are loose.

7. Component pin oxidation.

Virtual soldering. False soldering refers to the fact that the surface of the weldment is not fully coated with tin, and the weldment is not fixed by tin, which is caused by the surface of the weldment is not cleaned or the flux is used too little and the welding time is too short.

Virtual soldering is one of the most common defects. Sometimes after welding, it seems that the front and rear steel strips are welded together, but in fact it does not reach the degree of integration, the strength of the joint surface is very low, and the weld has to go through various complex processes on the production line, especially through the high-temperature furnace area and the high-tension tension leveling area, so the weld of virtual welding is very easy to cause a belt breaking accident on the production line, which has a great impact on the normal operation of the production line.

The essence of virtual welding is that the temperature of the weld joint surface is too low during welding, and the nugget size is too small or even to the degree of melting, but it has reached a plastic state, and it is barely combined after rolling, so it looks like it is welded, but in fact it is not completely fused.

The analysis of the causes and steps of virtual soldering can be carried out in the following order:

1) First, check whether there are impurities such as rust and oil stains on the joint surface of the weld, or uneven and poor contact, which will increase the contact resistance, reduce the current, and the temperature of the welding joint surface is not enough.

2) Check whether the lap amount of the weld is normal, and whether there is a decrease or cracking of the lap amount on the drive side. The reduction of the lap joint will make the joint area of the front and rear steel belts too small, so that the total stress surface will be reduced and can not bear the larger tension. In particular, cracking on the drive side causes stress concentrations, which make the cracking bigger and bigger, and finally break.

3) Check whether the current setting conforms to the process regulations, and whether the current setting does not increase accordingly when the thickness of the product changes, so that the current in the welding is insufficient and the welding is poor.

4) Check whether the pressure of the welding wheel is reasonable, if the pressure is not enough, it will be due to the contact resistance is too large, the actual current decreases, although the welding controller has a constant current control mode, but the resistance increases more than a certain range (generally 15), it will exceed the limit of current compensation, and the current can not increase with the increase of resistance, and cannot reach the set value. In this case, an alarm will be issued when the system is working normally.

In actual operation, if the exact cause of virtual welding cannot be analyzed for a while, the head and tail of the steel strip can be cleaned up, the amount of welding lap can be increased, the welding current and the pressure of the welding wheel can be increased appropriately and welded again, and the formation state of the weld can be paid close attention to in the welding, and the problem can be dealt with in most cases. Of course, if there is a problem with the control system, or if the grid voltage fluctuates and the weld is not welded, other measures must be taken to solve it.

The main reasons for this are:

1. Poor solder quality.

2. The reduction of flux is poor or the dosage is insufficient.

3. The surface of the welded place is not cleaned in advance, and the tinning is not firm.

4. The temperature of the soldering iron tip is too high or too low, and there is an oxide layer on the surface.

5. The welding time is too long or too short, and it is not well mastered.

6. When the solder has not solidified during soldering, the soldering components are loose.

7. Component pin oxidation.

Both virtual soldering and false soldering refer to the fact that the surface of the weldment is not fully coated with tin, and the weldment is not fixed by tin, which is caused by the fact that the surface of the weldment is not cleaned or the flux is used too little and the welding time is too short.

Circuit board soldering refers to poor soldering, that is, the solder joint is not completely in close contact with the pad, or there is a gap between the solder joint and the pad. Virtual soldering may cause the circuit board to lose its conductive function, or the waiter may have problems such as poor circuit connection and signal interference during use, which may cause damage to the circuit board in serious cases. The reasons for virtual welding may be that the welding temperature is not high enough, the welding time is not long enough, the welding pressure is not large enough, the welding material is not suitable, etc.

In order to avoid the occurrence of virtual soldering problems, it is necessary to strictly control the soldering parameters, and detect and test the soldered circuit board to ensure the pin quality and connection reliability of the solder joints.

Virtual soldering refers to the fact that the two parts of the solder joint (usually the component and the pad) are not completely bonded together during the soldering process of the circuit board, resulting in the failure of the circuit signal to be transmitted normally or abnormal. Virtual soldering may be caused by insufficient solder amount, low soldering temperature, too short soldering time, insufficient soldering pressure and other factors. The harm of virtual soldering is greater, it will not only lead to abnormal circuit signals, but also may affect the life of components and even lead to serious consequences of bridge calendars.

Therefore, when soldering the circuit board, it should be operated in strict accordance with the operating specifications to ensure the quality of soldering. For the problem of virtual soldering, it can be repaired by reheating, adding solder, etc., to ensure the normal use of the circuit board.

Many points on the circuit board are soldered, and if they are not soldered, they will be loose inside, which is virtual soldering.

Virtual soldering is a common type of line failure, and there are two kinds:

One is in the production process, caused by improper production process, the unstable state of time and time;

The other is that after long-term use of electrical appliances, some parts with serious heating, the solder joints at the welding feet are very easy to appear aging and peeling.

The main reason for this.

1.Poor solder quality;

2.Poor reducibility or insufficient dosage of flux;

3.The surface of the welded place is not cleaned in advance, and the tinning is not firm;

4.The temperature of the soldering tip is too high or too low, and there is an oxide layer on the surface.

Virtual welding is not welded firmly. If it is a circuit board, it means that the surface is not fully coated with tin, and the weldments are not fixed by tin, resulting in poor contact, and the time is on and off, which is mostly caused by the surface of the weldment is not cleaned or the flux is used too little and the soldering time is too short.

The above is general,Classification,The virtual soldering of the graphics card part will lead to unstable images,Blurred screen,Black screen,Articles,The system frequently reports errors,If it's serious, you can't turn on the motherboard for a long time,It depends on what chip you're soldering,For example, the virtual soldering of the tube hard disk transmission may cause the hard disk to be found and so on。