Weld Inspection
KNOWLEDGE
WELD INSPECTION
Methods for evaluating defects and structural integrity in welded materials.
WELD INSPECTION AND SAMPLE PREPARATION
Welding is a fabrication or sculptural process that joins materials, usually metals or thermoplastics, by causing coalescence. This is often done by melting the work pieces and adding a filler material to form a pool of molten material (the weld pool) that cools to become a strong joint, with pressure sometimes used in conjunction with heat, or by itself, to produce the weld. This is in contrast with soldering and brazing, which involve melting a lower-melting-point material between the work pieces to form a bond between them, without melting the work pieces.
Welds can be geometrically prepared in many different ways. The five basic types of weld joints are the butt joint, lap joint, corner joint, edge joint, and T-joint. Other variations exist as well—for example, double-V preparation joints are characterized by the two pieces of material each tapering to a single center point at one-half their height. Single-U and double-U preparation joints are also fairly common—instead of having straight edges like the single-V and double-V preparation joints, they are curved, forming the shape of a U. Lap joints are also commonly more than two pieces thick—depending on the process used and the thickness of the material, many pieces can be welded together in a lap joint geometry.
“After welding, a number of distinct regions can be identified in the weld area. The weld itself is called the fusion zone—more specifically, it is where the filler metal was laid during the welding process.
The properties of the fusion zone depend primarily on the filler metal used, and its compatibility with the base materials. It is surrounded by the heat-affected zone, the area that had its microstructure and properties altered by the weld. These properties depend on the base material’s behavior when subjected to heat. The metal in this area is often weaker than both the base material and the fusion zone, and is also where residual stresses are found.”
Quality control of welded materials is a critical process in industrial production. Weld inspection is conducted to determine the structural integrity, mechanical properties, and defect-free nature of the weld seam. Metkon offers solutions that ensure precise and repeatable preparation and analysis of welded samples.
SAMPLE PREPARATION PROCESSES
Proper sample preparation is crucial for successful weld inspection. Metkon provides high-quality equipment and solutions for every stage of sample preparation.
Cutting
Precise cutting of welded samples is essential for accurate analysis. Metkon’s cutting machines ensure clean and smooth cuts while preserving sample integrity.
Features:
- High-precision cutting machines
- Cooling system to prevent thermal damage
- Suitable cutting discs for different materials
- Low-deformation, clean cutting
Mounting
To ensure proper handling and protection, samples are mounted using hot or cold mounting techniques. Metkon’s mounting systems provide secure encapsulation for reliable analysis.
Features:
- Thermoset and thermoplastic resin options
- Manual and automatic mounting solutions
- Optimal edge protection and surface integrity
- Enhanced mechanical and thermal durability
Grinding & Polishing
Welded samples require smooth surfaces for microstructural analysis. Metkon’s polishing systems minimize surface defects, ensuring clear and repeatable results.
Features:
- Various abrasive papers and diamond suspensions
- Automatic and manual polishing systems
- Uniform surface quality and high precision
- Contamination-free surface preparation
Etching
Etching is performed to reveal the microstructure of the sample. Using appropriate etchants, the microstructural characteristics of the weld zone become visible.
Features:
- Chemical solutions for different materials
- Standard-compliant etching procedures
- Safe and controlled application
- Enhanced visibility of microstructural features
HARDNESS TESTING & IMAGE ANALYSIS
Hardness measurement is a critical step in determining the mechanical properties of the weld zone. Metkon’s hardness testing devices provide precise and reliable hardness measurements.
Hardness Testing
Different hardness test methods evaluate the mechanical performance of the weld zone.
Features:
- Vickers, Rockwell hardness test methods
- Micro and macro hardness measurements
- Automatic and manual test options
- High-accuracy hardness profiling across the weld zone
Imagin Analysis with Mesura 200
Image analysis systems are crucial for evaluating weld seams and microstructures. Imagin Mesura 200 offers precise measurement and analysis capabilities for detailed evaluations.
Features:
- Automatic contour and measurement functions
- High-precision microstructure analysis
- User-friendly interface and reporting tools
- Advanced defect detection in weld areas
Metkon’s advanced solutions ensure high-quality weld inspections and reliable sample preparation for industrial and research applications. For more information, feel free to contact us
GET YOUR GUIDE FOR WELD INSPECTION
Discover everything you need to know about the Weld Inspection with our comprehensive brochure.
