We Super Steel Manufacturing Co.,Ltd(SMC) are amongst the top manufacturers and suppliers for the seamless steel pipe, welded steel pipe, OCTG products and fittings from China. We have been manufacturing and supplying these products to the industry since 1993, and received repeat orders and appreciation from our valued customers.
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Always up to date. In this column you can find the steel pipe related articles, including industry trends, product standards and materials, and some technical guidelines.
The pre-finished welding process for submerged arc welded spiral pipes (SSAW) has gained popularity due to its high efficiency and strong weld quality. However, welding defects can still occur, impacting the overall quality. Here are preventive measures for common issues such as cracks, undercuts, pores, incomplete welds, and irregular weld beads.
Cracks in Weld Seam
Cause: Crystallization cracks from excessive welding energy, often due to oversized grooves or high current.
Prevention: When cracks are detected, perform pickling or repair welding to identify internal vs. external cracks. Reduce welding energy by adjusting current and voltage, and increase the wire's dry elongation.
Undercut Defects
Cause: Fluctuations in current and voltage from unstable wire feeding; improper welding parameters.
Prevention: Check the wire feeding system for stability. Ensure all components are functioning properly, then readjust welding parameters and conduct trial welds.
Porosity and Slag Inclusion
Causes: Contaminated welding wire or flux, dirty pre-weld surfaces, or existing inclusions.
Prevention: If porosity is detected, first check the purity of the welding wire and flux. Clean any contaminants, and ensure pre-weld surfaces are clear of debris. Adjust current or reduce speed to allow gas to escape.
Incomplete Welding
Causes: Insufficient energy or welding deviation.
Prevention: Monitor changes in pre-weld seam height and groove size, and adjust parameters accordingly, mainly focusing on current adjustments within 100A. If welding deviation occurs, realign the equipment and ensure proper tracking.
Irregular Weld Beads
Causes: Vibration of the internal welding head, instability of rollers, or poor pre-weld forming.
Prevention: Inspect for contact between the welding components and the pipe wall. Check roller alignment and stability, and assess the steel pipe's diameter and straightness to eliminate any movement that could affect welding.
By implementing these preventive measures, the quality of submerged arc welded spiral pipes can be significantly improved, ensuring reliable performance in various applications.
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