The reason for the false welding of false welding, and the reason for the false welding of the secon

In the production and manufacturing of electronic components, soldering work is often required. Among them, wave soldering and selective wave soldering are two common welding methods. Although they both use thermal energy to connect electronic components to circuit boards, there are certain differences between them in practical applications.

Wave soldering is a traditional type of welding. In the wave soldering process, the solder is glued to the circuit board where the electronic components are already installed, and then the solder is melted by heating so that it can be bonded to the electronic components and the circuit board to form a complete connection. During the soldering process, the soldering equipment immerses the circuit board in molten solder so that it is connected to the surface of the solder joints covered by the electronic components.

As the solder cools, the solder joints and electronic components are firmly connected to the circuit board....

1) The electrode melts but the weldment does not melt, and the weld metal at the solder joint is too thin.

2) There are cold cracks in the weld.

3) The solder paste is not warm enough or expires.

4) The furnace temperature curve is not appropriate.

5) Component material problems.

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 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 yet solidified in soldering, the soldering element is loose;

7.Component pin oxidation.

The main reason for false welding is that the diameter of the electrode is too large and the welding current is too small.

C02 gas arc welding is to use welding wire instead of welding rod, through the wire feed wheel through the wire feeding hose to the welding gun, through the contact nozzle conduction, in the C02 atmosphere, with the base metal between the arc, by the arc heat for welding. C02 gas is sprayed out along the perimeter of the welding wire through the nozzle of the welding torch during operation, causing a local gas protective layer around the arc to mechanically isolate the droplets and the solution pool from the air, so as to protect the welding process to be stable and continuous, and obtain high-quality welds.

Hope it helps, thank you.

The welding current factor in the second welding determines the depth of the weld penetration, and the welding voltage determines the width of the weld penetration.

Welding Precautions:

First, the length of the arc.

The length of the arc is related to the type of electrode coating and the thickness of the coating. However, short arcs should be taken as much as possible, especially low-hydrogen electrodes. Long arcs can cause stomatosis.

The short arc can avoid harmful gases such as O2 and N2 in the atmosphere from invading the weld metal and forming undesirable impurities such as oxides and affecting the quality of the weld.

Second, the welding speed.

The appropriate welding speed is based on the diameter of the welding rod, the type of coating, the welding current, the heat capacity of the welded object, the beginning of the structure and other conditions, and the corresponding changes can not be made. Maintain the right welding speed, and the slag can cover the molten pool well. All kinds of impurities and gases in the molten pool have sufficient time to float out, so as to avoid the formation of slag inclusions and porosity of the weld.

If the speed of the rod is too fast during welding, the shrinkage stress will increase when the welding part is cooled, causing cracks in the weld.

Third, the key points of welding wire selection.

The selection of welding wire should be based on the type of steel to be welded, the quality requirements of the welded parts, the welding construction conditions (plate thickness, groove shape, welding position, welding conditions, post-welding heat treatment and welding operation waiting), cost, etc.

Fourth, the order to be considered in the selection of welding wire is as follows:

1. Select the welding wire according to the steel type of the welded structure For carbon steel and low-alloy high-strength steel, the welding wire that meets the mechanical property requirements is mainly selected according to the principle of "equal strength matching". For heat-resistant steel and weathering steel, it is mainly important to consider the consistency and similarity of the chemical composition of the weld metal and the base metal to meet the requirements of heat resistance and corrosion resistance.

2. The selection of welding wire according to the quality requirements of the welded parts (especially the impact toughness) is related to the welding conditions, groove shape, shielding gas mixing ratio and other process conditions, and the welding materials that achieve the maximum welding efficiency and reduce the welding cost should be selected under the premise of ensuring the performance of the welded joint.

3. Select the diameter of the welding wire according to the on-site welding position corresponding to the thickness of the welded workpiece, determine the current value used, and select the welding wire grade suitable for the welding position and current with reference to the product introduction information and use experience of each manufacturer. The welding process performance includes arc stability, spatter particle size and quantity, slag removal, weld appearance and shape, etc. For the welding of carbon steel and low-alloy steel (especially semi-automatic welding), the welding method and welding material are mainly selected according to the welding process performance.

4. Select the welding wire according to the steel type of the welded structure For carbon steel and low-alloy high-strength steel, the welding wire that meets the mechanical property requirements is mainly selected according to the principle of "equal strength matching". For heat-resistant steel and weathering steel, it is mainly important to consider the consistency and similarity of the chemical composition of the weld metal and the base metal to meet the requirements of heat resistance and corrosion resistance.

Hello dear <>

Arc welder false welding is usually caused by one of the following reasons:1Power issues:

Problems such as too low or too high power supply voltage and unstable power supply voltage will lead to unstable welding current, which will cause false welding. 2.Electrode Issues:

Problems such as poor welding electrodes and improper use of electrodes can lead to unstable arc and false welding. 3.Gas Issues:

Factors such as oxygen and moisture in the welding environment may affect the stability of the arc, resulting in false welding. 4.Welding Material Issues:

Dirt, grease and other substances on the surface of the welding material may affect the effect of the weld joint, thus causing false welding. 5.Operational Issues:

False welding can occur if the welder is not skilled or the operation is improper, such as the welding fluid is too fast or the welding distance is too far. In order to avoid the occurrence of false welding, it is necessary to carry out regular maintenance and maintenance of the welding machine to ensure the normal use of the power supply and electrodes of the welding machine. At the same time, the staff operating the welding machine need to be proficient in welding technology, as well as pay attention to the cleanliness and dryness of the welding materials and environment, which can effectively reduce the occurrence of false welding.

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There are many reasons for false welding of arc welders, and the following are a few common reasons:1Improper electrode selection:

If the electrode used does not match the workpiece, or if the electrode is severely worn, false welding is likely to occur. 2.Gas Poor Type Rent:

Inadequate or uneven gas protection can lead to the ingress of oxygen during the welding process, resulting in burnt holes or false welds. 3.The current is too low:

If the current is too small, the arc is easy to extinguish during welding, resulting in false welding. 4.Excessive current:

If the current is too large, the arc is too strong during welding, resulting in the inability to control the arc, and it is easy to cause false welding. Solution: And early 1

Choose the right electrode: choose the matching electrode according to the material and requirements of the welding workpiece, and pay attention to the wear degree of the electrode, and replace it in time. 2.

Make sure the gas is well protected: Use the appropriate shielding gas and nozzles to ensure that the gas protection is uniform and that oxygen does not enter the weld. 3.

Adjust the current size: According to the workpiece material and welding requirements, select the appropriate current size to avoid too much or too little current. 4.

Control the welding speed: the welding speed should be appropriate, not too fast or too slow, otherwise it is easy to cause false welding. 5.

Clean the welding surface: clean the workpiece before welding to ensure that the welding surface is clean and avoid debris from entering the weld. 6.

Do a good job in welding technology: master the welding technology, minimize the shaking and flutter during welding, and ensure the quality of welding.

Hello, dear <>

There are several reasons for false welding of arc welding machines:1Insufficient gas flow:

If the gas flow is insufficient, it will lead to poor gas flow, and the oxygen content in the welding area will increase, which will affect the arc stability, and even extinguish the arc, resulting in false welding. 2.Electrode material mismatch:

Mismatched electrode materials or the use of inferior electrodes can lead to arc instability, which can lead to false welding. 3.Too much or too little current:

The current regulation of the arc welding machine is unreasonable, and too large or too small the current will lead to false welding. 4.Dirty or oxidized surface of welding material:

Dirty or oxidized surface of the weld material can affect the stability of the arc and also reduce the quality of the weld. 5.The weld design is not reasonable:

Unreasonable weld design, such as inappropriate opening and concealment of the weld, unreasonable spacing and leakage, etc., will also lead to the phenomenon of arc welding and false welding. 6.Poor welding environment:

Bad environmental conditions, such as too high temperature, too high humidity, etc., will affect the stability of the arc, and will also cause false welding. I hope it can help you and I wish you a happy life<>