1.How do mechanical measuring tools measure?
Micrometer (Micrometer Screw)
Introduction: This is the most commonly used, basic, and highly accurate contact measuring tool.
Advantages: Relatively affordable, high accuracy (up to 0.001mm), stable and reliable, and requires no power supply.
Disadvantages: The measuring pressure may cause slight indentations on soft galvanized surfaces; measurement efficiency is low, making it suitable for spot checks.
Usage Precautions: Keep the anvil and micrometer screw clean and apply a constant measuring force.
2.What are the advantages and disadvantages of electronic measuring tools?
Introduction: The principle is the same as a mechanical micrometer, but the results are displayed digitally.
Advantages: Intuitive and fast readings, with data output to reduce human error.
Disadvantages: Requires batteries and is more delicate than mechanical micrometers.
3.What are the advantages and disadvantages of non-contact measurement tools?
Introduction: Installed on a galvanizing line, it provides real-time, continuous thickness measurement of high-speed steel strip.
Advantages: 100% full coverage, fast response, and extremely high accuracy, making it a core device for automated quality control.
Disadvantages: Extremely expensive, it is only suitable for production lines in large steel mills.
4.What are the advantages and disadvantages of magnetic thickness gauge?
Introduction: Utilizes the principle of magnetic induction. Since the base material (steel) is magnetic and the zinc coating (zinc) is non-magnetic, the instrument measures changes in magnetic flux or magnetic resistance to calculate the thickness of the zinc coating.
Advantages:
Non-destructive testing: Does not damage the zinc coating.
Quick and easy: Can be measured at any time at the production site, warehouse, or processing workshop.
High accuracy: Meets daily quality inspection needs.
Portable: Handheld models are available.
Note: Calibration on a standard plate is required before measurement, and the measuring surface must be clean and flat.
5.What are the advantages and disadvantages of metallographic microscopy?
Introduction: A metallographic specimen is prepared by cutting a sample from a galvanized coil, mounting it, grinding, polishing it, and etching it. The cross-section is then observed under a microscope, allowing the thickness of the galvanized layer to be directly measured.
Image Analysis Software: Modern metallographic systems connect to computers and software for semi-automatic or automatic measurement.
Advantages: It is the most accurate and intuitive method, considered the definitive basis for arbitration disputes.
Disadvantages: It is destructive, and the sample preparation process is complex and time-consuming, requiring specialized laboratories and operators.