Sheet metal is one of the most in-demand types of rolled metal and is widely used in construction, mechanical engineering, metalworking, and industrial equipment manufacturing. The strength, geometric accuracy, weldability, and service life of finished products directly depend on the quality of the sheet metal. Errors during quality control can lead to excessive material consumption, defective products, and reduced structural reliability.
Company ArtMetal (art-metal.com.ua), with extensive experience working with sheet metal, uses a systematic approach to metal quality control. In this article, we'll discuss the main methods for inspecting sheet metal, what to look for, and the most common mistakes.
Why check the quality of sheet metal products?
Even with certifications and a reputable supplier, sheet metal products must undergo incoming inspection. The reasons are obvious:
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possible deviations in geometry and thickness;
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damage during transportation;
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discrepancy with the declared steel grade;
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the presence of hidden defects in the metal structure;
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influence of storage conditions.
Proper testing helps avoid the use of low-quality materials and ensure consistent production quality.
Step 1. Checking the accompanying documentation
Quality control begins with reviewing the documents accompanying the sheet metal batch. The supplier is required to provide:
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quality certificate or batch passport;
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indication of steel grade;
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chemical composition data;
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mechanical characteristics;
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production standard (GOST, DSTU, EN, etc.);
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melt and batch number.
It is important to ensure that the documents correspond to the exact batch of metal that arrived at the warehouse, and that the stated characteristics are suitable for the operating conditions.
Step 2. Visual inspection of the sheet surface
Visual inspection is the simplest, yet crucial, stage of the inspection. The inspection is conducted under good lighting and includes an assessment of:
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presence of rust and corrosion;
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cracks, tears, delamination;
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dents and impact marks;
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rolling defects;
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traces of oil, moisture and dirt.
Particular attention should be paid to the edges of the sheet, where defects appear most often.
Stage 3. Control of geometry and dimensions
The geometric accuracy of sheet metal products directly impacts subsequent processing. The following are checked:
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sheet thickness over the entire area;
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length and width;
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flatness;
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waviness and warping;
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condition of the edges.
Measurements are performed using:
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micrometers;
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calipers;
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metal rulers and tape measures;
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levels and calibration rulers.
Deviations are compared with the permissible limits specified in standards and design documentation.
Stage 4. Checking the steel grade and metal structure
It is impossible to visually determine the steel grade, therefore, for important projects, additional control methods are used:
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spark method for preliminary assessment of composition;
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spectral analysis for precise determination of chemical composition;
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ultrasonic testing to detect internal defects;
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hardness control.
These methods make it possible to identify discrepancies that cannot be detected during a normal inspection.
Stage 5. Checking weldability and technological properties
For metal structures, it's important that sheet metal be weldable and formable. When necessary, the following is performed:
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test welds;
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bending tests;
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testing the metal's reaction to thermal exposure.
Poor weldability may indicate incorrect chemical composition or a violation of rolling technology.
Stage 6. Assessment of the surface condition to be coated
If sheet metal is to be painted, galvanized or coated with other materials, it is important to check:
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uniformity of surface;
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absence of deep corrosion;
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suitability of metal for preparation and processing.
Surface quality directly affects the adhesion of protective coatings and their service life.
Typical mistakes when inspecting sheet metal products
In practice, the following mistakes are often made:
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trusting only certificates without actual control;
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lack of thickness measurements over the entire sheet area;
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ignoring minor defects;
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refusal of additional testing for important projects;
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lack of recording of identified deviations.
These errors can lead to significant losses already at the production stage.
How ArtMetal controls the quality of sheet metal products
Company ArtMetal uses an integrated approach to incoming inspection:
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documentation verification;
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visual and instrumental control;
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random laboratory tests;
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control of storage conditions;
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working with trusted suppliers.
This approach ensures consistent quality of the metal used in projects of varying complexity.
Conclusion
Quality control of sheet metal products is a mandatory step for any metal production process. Proper incoming inspection helps prevent defects, improve structural reliability, and reduce costs.
Experience ArtMetal shows that attention to detail at the metal acceptance stage is the basis for a high-quality result and long-term reliability of metal structures.
