15CrMo under high temperature conditions, having antioxidant activity and sufficient high-temperature strength as well as good heat resistance, is pearlitic heat resistant steel, the alloying elements chromium, molybdenum, widely used in the manufacture of boiler, turbine, power machinery, industrial parts and heat pipe work at a high temperature in the furnace, petrochemical and other industrial sectors.
Guangzhou, a large steel-making two dust Engineering, dust removal system using German technology, the leading domestic level in the steel-making in environmental technology. Wherein the electric furnace and the converter heat pipe material 15CrMo steel pipe having a diameter of 2400mm, a thickness of 6mm. Pipeline topical reinforcement ring reinforcement, no lining inside. 15CrMo heat resistant steel used in the project is currently the diameter the dust high temperature piping design using the highest temperature of ≤ 540 ℃, welding and acceptance GB50235-1997 quality standard. One of the project, the same pipe material, improper welding process and measures after welding serious cracks, welding procedure test based on this pre-construction.
The specific circumstances of the project, based on rich argon welding is easy to operate, stable arc, small spatter, high Welding Assembly efficiency, weld beautiful, good mechanical properties of welded joints using manual arc Welding Rod base is determined by demonstrating rich argon welding (Ar: 80%, CO2: 20%) to cover the welding process to combine. Large Diameter and Thin 15CrMo heat resistant steel pipe welding a suitable method to explore the technical problems solved Large Diameter and Thin 15CrMo easy to produce heat-resistant pipe weld cracking.