about us
As a professional welding material manufacturer, Hangzhou Lin'an Dayang Welding Co., Ltd. has always focused on the research and development and production of welding materials since its establishment in 1995. With its profound industry accumulation and strong comprehensive strength, it has established a good reputation in the domestic and foreign markets.
The company has a modern hydraulic equipment production line with an annual production capacity of 5,000 tons of welding rods, equipped with advanced testing instruments and production equipment. From raw material procurement to finished product delivery, a full-process quality control system has been established to ensure that each batch of ENiCrMo-4 filler wire meets high standards.
The technical team is composed of experienced welding material experts and engineers. They can not only accurately control the production links, but also provide customers with professional technical support, including welding process guidance, difficult problem solving, etc. The company has passed the ISO 9001 quality management system certification, and its products meet international standards such as AWS. They are exported to many countries and regions and have accumulated a large number of high-quality customers in the fields of petrochemicals, marine engineering, energy and power.
Introduction to welding performance
- ENiCrMo-4 filler wire has excellent welding performance in many aspects and is an ideal choice for dealing with complex working conditions.
- Excellent corrosion resistance: Its deposited metal contains a high proportion of chromium (about 19-21%) and molybdenum (about 15-17%), which can form a dense passivation film in highly corrosive media such as chloride ions, sulfuric acid, and hydrochloric acid, effectively resisting pitting, crevice corrosion, and stress corrosion cracking. In harsh environments such as seawater and chemical waste liquids, the welded joints can remain stable for a long time, greatly reducing the risk of equipment failure caused by corrosion.
- Stable high-temperature performance: In high-temperature environments of 650℃ and above, it can still maintain high strength and toughness, and has excellent creep resistance. Welded joints are not prone to deformation and cracking during long-term high-temperature operation, and are suitable for welding of high-temperature furnace tubes, high-pressure steam pipelines and other equipment.
- Good welding processability: The welding wire melts evenly, has good fluidity, good fusion with the base material, stable arc during welding, less spatter, and beautiful weld formation. Whether it is manual tungsten inert gas arc welding (GTAW) or metallurgical gas shielded welding (GMAW), it can be easily operated to reduce the occurrence of welding defects such as pores and lack of fusion.
Customer feedback
• A large chemical company: "We used your company's ENiCrMo-4 filler wire in the welding of sulfuric acid storage tanks. After two years of use, there is no sign of corrosion in the welded parts, and the sealing is still good. Compared with other welding wires used before, we are very satisfied with the corrosion resistance of this welding wire, which greatly reduces the equipment maintenance cost."
• Offshore engineering company: "In the pipeline welding project of the seawater cooling system of the offshore platform, the ENiCrMo-4 filler wire performed well. After long-term exposure to high-salt and high-humidity environment, the weld did not rust or crack, ensuring the stable operation of the entire system. It is our preferred material for offshore engineering welding."
• Power equipment manufacturer: "When used for welding nuclear power plant steam generators, the welding processability and high-temperature performance of this welding wire met our expectations. All indicators of the weld inspection were qualified, providing reliable guarantee for the safe operation of the equipment."
Key points in welding operation
• Current and voltage control: Select appropriate parameters according to the welding method and wire diameter. When welding with GMAW, the recommended current for 1.2mm diameter welding wire is 180-240A and the voltage is 24-30V; when welding with 1.0mm diameter welding wire with GTAW, the current is 80-120A and the voltage is 10-16V. Avoid excessive current that causes burn-through or coarse grains, and excessive current that causes unfusion.
• Shielding gas management: Use argon with a purity of ≥99.99% as shielding gas. The gas flow rate is 20-25L/min for GMAW and 8-12L/min for GTAW. Ensure that the gas flow rate is stable during welding to prevent air from invading the molten pool and causing oxidation. At the same time, pay attention to wind protection and build a windproof shed if necessary.
• Welding speed and technique: Maintain a uniform welding speed, generally 30-60cm/min for GMAW and 10-20cm/min for GTAW. Use a straight line or small swinging method to move the wire. The swing amplitude should not be too large to avoid affecting the protection effect and weld formation, and ensure that the molten pool is fully fused.
• Interlayer cleaning: When multiple passes are welded, use a stainless steel wire brush to clean the spatter and oxide scale on the weld surface after each weld. After checking for defects, proceed to the next weld to avoid impurities affecting the quality of subsequent welding.
• Arc closure treatment: When closure, the current should be slowly reduced to fill the arc pit to prevent the formation of arc pit cracks. If necessary, the reflow method can be used to closure the arc to ensure that the weld is full at the closure.
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