What are the common defects in automobile terminal welding?

Automotive terminal welding is used to complete the electrical connection of an accessory product, industrial division belongs to the adapter. With the increasing degree of industrial automation and the demand for industrial control becoming more and more severe, the demand for terminal blocks is gradually increasing.

From the application point of view, the function that should be reached is: the central conduction of the contact part must be conduction, and the contact is reliable. The central part that should not be insulated must be insulated reliably.

There are three common fatal defects in automotive terminal welding:

1, poor contact

Due to the unreasonable structural design of the contact parts, the wrong selection of materials, the instability of the mold, the abnormal processing size, the rough surface, the unreasonable surface treatment process such as hot disposal electroplating, the improper assembly, the poor storage and operation environment and the improper operation will constitute poor contact in the contact parts and the matching parts.

2, poor insulation

Due to the existence of metal residues on the surface or inside the insulator, surface dust, flux and other pollution by moisture, organic material precipitates and harmful gas adsorption film and surface water film fusion to form an ionic conductive channel, moisture absorption, mildew, insulation material aging and other reasons, will constitute short circuit, leakage, breakdown, low insulation resistance poor insulation phenomenon.

3. Poor fixation

Due to material, design, process and other reasons cause the structure is not reliable between the plug and the socket, the abnormal difference between the pin and the jack, will constitute a serious result of the power transmission and signal control infix of the control system.

Due to unreliable design, wrong material selection, improper selection of forming process, poor process quality such as hot disposal, mold, assembly, welding, and assembly is not in place, etc., will constitute poor fixing.

In addition, due to coating peeling, corrosion, damage, plastic shell flash, unity, rough processing of contact parts, deformation and other reasons caused by the appearance of the poor, due to the positioning lock with the size of the excess, poor processing quality divergence, total separation force is too large and other reasons caused by poor interchange, is also a common disease, frequently occurring. These defects can generally be found and eliminated in time during inspection and application.

In order to ensure the quality and reliability of automotive terminal welding and prevent the occurrence of the above defect problems, it is recommended to discuss and formulate the corresponding selection technology according to the technical conditions of the product, and carry out the following targeted reliability checks to prevent failure.