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Custom Sheet Metal Fabrication: In-House vs Outsourced – Who Really Assures?
The factory you contacted promised no outsourcing, but in reality, they secretly subcontracted the parts to multiple external suppliers. Cutting, bending, stamping, welding, surface treatment… Each did their own thing.
Each had its own strengths, but the quality control was inconsistent. Eventually, the parts couldn’t be assembled, the surfaces had flaws, and the delivery dates kept being postponed – and it was always you who suffered the losses.
Today, let’s talk about the flaws of the outsourcing model. How can the entire process be self-managed from the root cause?
5 Major Drawbacks of Outsourcing
Outsourced stamping hole off by 0.1mm, bending angle off by -0.2°, weld shrinkage 0.15mm — each “passes” but assembly fails.
Your main factory blames subcontractors; you have no contract with them and nowhere to turn.
Every drawing change must pass through multiple subcontractors, turning days into weeks.
Each subcontractor inspects only its own step; no one validates the final assembled part.
One subcontractor slips 3 days — the whole chain slips. Your schedule pays the price.
Our solution: Full-process self-operation system
🔹 Laser cutting
We have two sets of 6kW laser cutting equipment with an accuracy of ±0.1mm. It can cut carbon steel, stainless steel and aluminum plates. Our own cutting process ensures the accuracy of the cutting material size, providing perfect blanks for subsequent bending and stamping.
40 sets of 80-400 ton press machines, covering precision punching, deep drawing, and continuous mold production. During high-speed pressing, we use an image-measuring instrument to monitor burrs and contours in real time, ensuring the cross-sectional quality of each pressed part.
In conjunction with 3 sets of bending machines, 4 groups of hydraulic presses, and a CNC bending center. All bending angles are subject to online detection by CMM to ensure batch consistency.
Automatic spot welding machine 1 set + welding production line 3. Different welding processes are adopted for structural parts and appearance parts. After welding, they are polished smoothly, leaving no welding slag.
Complete surface treatment production line 2 sets (spraying, electroplating, oxidation, wire drawing, etc.). All are operated independently, eliminating problems such as color difference, poor adhesion, and uneven thickness caused by outsourcing.
Auxiliary processes and other technologies: 12 sets of drilling machines, 4 sets of laser marking machines (drilling and marking are completed within the factory); in addition, CNC machining (2 five-axis machines + 3 vertical machines) and metal casting (1 casting machine).
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As a reliable partner for Custom Sheet Metal Fabrication, we have a dedicated quality inspection team. Click here to view the complete quality inspection process from incoming steel sheet and coil to finished, inspected parts.
We have provided customers across industries such as automotive, healthcare, electronics, and industrial equipment with thousands of sheet metal part types for the entire fabrication process.
We understand that: True customization is not about “trying as much as possible”, but rather about every size being recorded and every process being under control.
