Welding equipment quality appraisal

welding equipment is based on the core principle of arc/laser energy control and process stability synergy. By optimizing welding current accuracy, arc stability and penetration control, it achieves synergy of weld strength, appearance quality and production efficiency. It is widely used in the fields of steel structures, pressure vessels, automobile bodies and pipeline welding. In thick plate welding, it is used for fusion line control of multi-layer and multi-pass welding; in precision welding, it meets the spatter suppression of stainless steel/aluminum alloy; in automated production lines, it ensures the repeatable positioning accuracy of robot welding. Compared with traditional equipment, high-end welding equipment has features such as digital waveform control (pulse/double pulse adaptive), intelligent monitoring and energy efficiency optimization, and is the core equipment of the welding process.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide welding equipment quality appraisal services. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for welding equipment quality appraisal.

As the complexity of welding processes increases, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: the weld strength is not up to standard, spatter control failure;

2, material defects: the welding gun cable has poor high temperature resistance, and the heat dissipation efficiency of the inverter module is attenuated;

3, process problems: arc voltage fluctuations, wire feeding mechanism stuck rate;

4, contract performance disputes: core modules (such as imported IGBT power devices, digital welding machine control systems) are inconsistent with the technical agreement.

Welding equipment litigation quality appraisal mainly includes the following technical methods:

1. Equipment appearance inspection

Conduct a comprehensive inspection of the appearance of the equipment, including whether the overall structure of the equipment is complete and whether there is obvious deformation or damage; whether there are defects such as rust, scratches, etc. on the surface of the equipment; whether the identification of the equipment is clear and accurate, etc. Appearance inspection can initially determine whether the equipment has been damaged by external forces during transportation, installation or use.

2, performance test

According to the technical contract and relevant industry standards, various performance indicators of the equipment are tested. For example, test the welding current, voltage, welding speed, welding strength and other parameters of the welding equipment to check whether the equipment can operate stably and whether the various performance indicators meet the requirements.

A pressure vessel factory of the applicant signed a "Digital MIG Welding Machine Purchase Contract" with an equipment manufacturer of the respondent, and it was agreed that spatter particles should be ≤30 particles/m. After being put into production, the measured spatter reached 120 pieces/m. The manufacturer argued that it was caused by impure protective gas.

identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of "welding equipment", contract technical agreements, on-site inspection case materials and other data, and made a comprehensive technical analysis. The following quality analysis opinions:

The current waveform ripple coefficient of the welding equipment involved in the case is 8% (agreement ≤ 5%), the wire feed speed fluctuates ±15% (agreement ±3%); the Si content of the welding wire is only 0.6% (agreement 0.8-1.15%), resulting in unstable droplet transfer.

The appraisal conclusion determined that defects in power supply control and material composition were the main causes of excessive splash.

Welding equipment quality appraisal report should include:

1, appraisal purpose (such as weld defect attribution, performance verification) and cited standards;

2, involved equipment model, control system version, welding parameter record;

3, detection method and equipment clearance Single (such as power analyzer, SEM);

4, detection data and failure correlation analysis (such as the impact of ripple coefficient on splash);