Effect of laser welding technology on weld microstructure of EN10025-4 S275M steel plates

The main steel plates for oil and gas pipelines are X42, X46, X52 (L360), X56 (L390), X60 (L420), X65 (L460), X70, X80. The specification range of steel plate used by the company for oil and gas pipelines: thickness 8mm-60mm. It can produce additional flaw detection requirements and Z15-Z35 tear resistance (thickness direction performance) steel plates EN10025-4 S275M steel plates, and can also provide Z-direction performance steel plates according to ASTM A770 and other standards.

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The preparation of EN10025-4 S275M steel plates galvanized steel before welding is the same as that of ordinary low-carbon steel. It is necessary to carefully handle the groove size and nearby galvanized layer. In order to achieve penetration, the groove size shall be appropriate, generally 60 ~ 65 °, with a certain gap, generally 1.5 ~ 2.5mm; in order to reduce the penetration of zinc into the weld, the galvanized layer in the groove can be removed before welding. In the practical work, the centralized beveling, no blunt edge technology for EN10025-4 S275M steel plates centralized control, two-layer welding process, reducing the possibility of incomplete penetration.

Classification of EN10025-4 S275M steel plates, steel plate, including strip steel: 1. Classified by thickness: (1) thin plate (2) medium plate (3) thick plate (4) extra thick plate 2. Classification by production method: (1) hot rolled steel plate (2) cold rolled steel plate 3. Classification according to surface characteristics: (1) galvanized sheet (hot galvanized sheet, electro galvanized sheet) (2) tin plate (3) composite steel plate (4) color coated steel plate 4. Classification by use: (1) bridge steel plate (2) boiler steel plate (3) shipbuilding steel plate (4) armored steel plate (5) automobile steel plate (6) roof steel plate (7) structural steel plate (8) electrical steel plate (silicon steel sheet) (9) spring steel plate (10) others

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