2023-12-18
High-frequency welding management properties: normal temperature mechanical properties, high-temperature mechanical properties, low-temperature properties, and corrosion resistance. The physical and chemical properties of high-frequency welded steel pipes mainly depend on the chemical composition of the steel, the organizational structure, and the purity of the steel, as well as the heat treatment method of the high-frequency welded steel pipes.
High-frequency welded steel pipe process performance: flattening, flaring, curling, bending, welding, etc.
High frequency welded steel pipe metallographic structure: low magnification structure (macro), high magnification structure (micro) M, B, P, F, A, S
Special requirements for high-frequency welded steel pipes: contract attachments and technical agreements.
High-frequency welded steel pipe inspection method:
First, chemical composition analysis: chemical analysis method, instrumental analysis method (infrared C-S instrument, direct reading spectrometer, zcP, etc.).
1. Infrared C-S meter: analyze ferroalloys, steelmaking raw materials, and C and S elements in steel.
2. Direct reading spectrometer: C, Si, Mn, P, S, Cr, Mo, Ni, Cn, A1, W, V, Ti, B, Nb, As, Sn, Sb, Pb, Bi
3. N-0 meter: gas content analysis N, O
Second, geometric dimensions and appearance inspection of high-frequency welded steel pipes:
1. High-frequency welded steel pipe wall thickness inspection: micrometer, thickness gauge, no less than 8 points at both ends and recorded.
2. Inspection of the outer diameter and ovality of high-frequency welded steel pipes: calipers, vernier calipers, and ring gauges to detect large and small points.
3. High-frequency welded steel pipe length inspection: steel tape measure, manual, automatic length measurement.
4. High-frequency welded steel pipe bending inspection: ruler, level (1m), feeler gauge, thin wire to measure bending per meter, and full-length bending.
5. High-frequency welded steel pipe end bevel angle and blunt edge inspection: square ruler, clamping plate.
Third, high-frequency welded steel pipe surface inspection: 100%
1. Manual visual inspection: lighting conditions, standards, experience, markings, high-frequency welded steel pipe rotation.
2. Non-destructive inspection: lighting conditions, standards, experience, markings, high-frequency welded steel pipe rotation.
3. Wave flaw detection UT: It is sensitive to surface and internal crack defects of uniform materials of various materials.