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Overview of Sheet Metal Welding & Assembly
Welding and assembly are the core post-forming processes of precision sheet metal manufacturing and key procedures to ensure the structural integrity and functional stability of finished sheet metal products. As essential supporting processes for foreign trade sheet metal customization, they connect scattered bent, cut and stamped sheet metal parts into complete structural components or finished products. Strictly following international manufacturing standards, standardized welding and precision assembly processes effectively solve the problems of loose connection, poor structural stability and low interchangeability of sheet metal parts. They are widely applicable to high-standard export products such as equipment enclosures, structural brackets, electrical cabinets, automotive sheet metal parts and medical equipment components, fully meeting the strict quality and appearance requirements of European, American, Southeast Asian and other global customers.
Core Process Principles
Welding Forming Principle
Sheet metal welding uses localized high temperature or pressure (with or without fillers) to fuse workpiece joints, creating a rigid integrated structure after cooling. Heat input is adjusted based on material and plate thickness to avoid deformation, burnout, oxidation and cracks. Fine-tuned welding parameters and processes make welds equivalent to base materials in mechanical properties, with structural strength and load capacity fully compliant with international industry standards.
Precision Assembly Principle
Guided by 3D drawings and assembly specifications, sheet metal assembly is a high-precision splicing process. Special tooling and positioning equipment ensure accurate alignment and fastening of welded parts. Rigorous control of gaps, flatness, verticality and dimensional tolerances achieves seamless fitting. Standard assembly workflows and locking processes prevent deviation, looseness and distortion, delivering finished products with stable precision and dependable performance.
Foreign Trade Grade Quality Control Standards
Welding Quality Standards
Weld seam: Uniform and smooth, free of skip welding, cold lapping, pores, cracks, spatter and weld slag.
Deformation: Post-weld workpiece deformation ≤ 0.1mm, without obvious bending or distortion. Structural performance: Weld joints are solid with even stress, free from fracture or loosening under normal load.
Surface appearance: Weld area has no oxidation discoloration, burn marks or scratches, fully complying with export inspection criteria.
Assembly Quality Standards
Dimensional tolerance: Overall assembly tolerance ±0.2mm, hole position tolerance ±0.1mm, conforming to ISO standards.
Gap control: Assembly gaps are consistent, with no uneven or oversized gaps.
Stability: All connections are secure, free of looseness, shake or abnormal noise.
Batch consistency: Uniform assembly effect and dimensional accuracy across batches, with good part interchangeability.
All sheet metal semi-finished parts undergo full pre-inspection to check dimensions, bending angles, appearance and flatness per drawings, and eliminate defective workpieces with deformation, size deviation, scratches and burrs. Welding and assembly joints are cleaned thoroughly to clear oil, dust, oxide and rust. Special materials including stainless steel and aluminum alloy get professional pre-treatment to avoid welding oxidation and assembly gaps. Custom welding & assembly solutions plus matched equipment and fixtures are configured per customer demands for standardized processing.
Complete CNC Bending Process Flow
Professional polishing is implemented on all weld seams to remove weld traces, sharp edges and uneven joints, achieving unified texture with base metal. Precision cold shaping is applied for slightly deformed workpieces to meet flatness, verticality and parallelism tolerance standards. Secondary welding inspection is carried out to rule out skip welding, cold lapping, cracks and pores, complying with export quality standards.
Assembly follows standard inside-out sequence for structural and functional components. Custom positioning fixtures and precision measuring tools ensure accurate butt joint of holes and mating surfaces. Available connecting ways include screw locking, riveting, clamping and seamless splicing as designed. Real-time monitoring on assembly gap, dimension and structural stability avoids offset, loose fitting and assembly flaws. High-precision products adopt multi-point calibration to ensure batch part interchangeability and consistency.
Full-item final inspection is conducted strictly per export standards and customer drawings, covering weld firmness, flatness, structural stability, dimensional tolerance, gap uniformity and appearance. Simulated service load test verifies structural stability without looseness, deformation and abnormal noise. Qualified products are filed and marked; defective products get targeted rework to ensure 100% delivery compliance with international standards.
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