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Project Introduction: Special Welding Machine for Automotive Latches

Aug 14,2026

Automotive door and trunk latch assemblies are core safety components of vehicle parts. Most latches feature irregular sheet metal composite structures with concentrated stress on welding points. Conventional welding machines have mismatched processes, which easily lead to insufficient fusion, cold solder joints, uneven strength and workpiece deformation. During vehicle operation, issues such as abnormal closing noise and loose locking often occur. Haifei dedicated automotive latch welder is specially developed for welding door and trunk latch assemblies. It ensures firm, reliable joints and serves as key production equipment to guarantee the safety and durability of vehicle locking systems.

I Customer Background & Production Pain Points

A manufacturer produces automotive door and trunk latches plus locking connecting assemblies, supplying finished parts to vehicle OEMs.

Deficiencies of original welding processes:

1.Poor matching of pressure and energy leads to shallow fusion and cold joints on stressed welding points; welded spots crack or fall off easily during fatigue testing of finished products.

2.Unstable clamping benchmarks cause deviation of latch position and angle after welding, resulting in inconsistent assembly gaps, jamming during opening/closing and abnormal driving noise.

3.Difficult to control welding heat input, leading to uneven local heating and workpiece warpage & deformation.

4.Unstable machine operation, fluctuating weld strength across batches; no parameter storage or data traceability function.

5.Universal equipment cannot adapt to stress characteristics of irregular latch structures, resulting unstable finished quality.

II Customer Requirements

1.Custom exclusive welding process matching irregular latch structures and stress points to improve weld fusion and boost impact & fatigue resistance of joints.

2.Optimize fixture positioning structure to unify clamping benchmarks, reduce position & angle deviation of latches, improve assembly consistency and eliminate abnormal closing noise & loose locking.

3.Upgrade welding control logic to stabilize pressure & energy output, forming full weld nuggets with uniform strength, reducing cold joints & cracking.

4.Reasonably regulate welding heat input to mitigate workpiece warpage and deformation.

5.Support storage & quick switching of parameters for multiple latch specifications to realize flexible multi-model production; all process data storable and traceable.

III Custom R&D Solutions

The professional R&D team repeatedly optimized schemes to tackle latch welding challenges:

1.Process Verification: Conduct multiple groups of welding tests for latches of different sizes, structures and plate thicknesses, optimizing core parameters including pressure, current and holding time.

2.Equipment Selection: Adopt Haifei dedicated latch welder. Parameters fit workpiece stress features with even pressure and concentrated energy. Weld nuggets are full and solid; controllable heat input narrows heat-affected zones and greatly reduces deformation.

3.Fixture Design: Custom profile-following positioning jigs lock clamping benchmarks, minimizing alignment and assembly gaps. Easy adjustment for switching production of latches for various car models.

4.Core Advantages

Solid Welds: Full fusion, excellent stress resistance

Precise Positioning: Tiny deviation, perfect fitting

Stable Performance: Low deformation, easy process control

IV Delivery & After-sales Feedback

Pre-acceptance and on-site equipment inspection completed. Continuous trial runs maintain stable welding qualification rate. All original production pain points fully resolved after commissioning. Customers praise timely, professional and thoughtful after-sales service.

V Haifei Corporate Mission

Meeting customers’ customized welding demands is Haifei’s core mission. We always uphold the philosophy of "Creating Value for Customers". Everything starts from your actual needs: whether you require single automatic machines, integrated stations or full production lines, inform us of your welding requirements and Haifei will conduct targeted R&D and customization for you. Meanwhile, we firmly hold the grand aspiration of "Striving for the Rise of Chinese Industry", adhering to corporate values of Gratitude, Self-improvement, Altruism and Win-win Results, and contribute Haifei’s strength to the development of intelligent industrial equipment in China.