Ultra-low hydrogen basic electrode for WB36 steel welding

A WB36, basic electrode technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of no patent and literature reports for steel electrodes, and achieve uniform slag coverage and molten pool fluidity Good, good process performance effect

CN100542733CActive Publication Date: 2009-09-23CHINA ELECTRIC POWER RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2009-09-23

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Abstract

The invention provides an ultra low hydrogen-alkalinity welding rod used for welding a WB36 steel, pertaining to the welding field of a material processing engineering. The invention is mainly applied to the welding of the WB 36 steel. No relevant patent or report in literature concerning the manufacture of the WB 36 steel welding rod has ever been found at home and abroad. The invention is characterized in that formula of a coating of the welding rod contains materials based on mass percent of 2-10 percent of ferromanganese, 4-6 percent of ferrosilicon alloy, 1-2 percent of aluminum, 1-4 percent of nickel powder, 3-8 percent of quartz, 1-3 percent of ferrocolumbium, 0.5-2.5 percent of ferrovanadium, 0.5-3 percent of bronze powder, 20-30 percent of fluorite and 35-45 percent of marble. The manufactured welding rod has good technique performance and welding technique features of little splash, good fluidity of a molten pool, uniform covered slag, delicate and beautiful welding seam and easy removal of slag, and so on. Content of diffusible hydrogen of deposited metal of the manufactured welding rod is effectively controlled and the content of the diffusible hydrogen of deposited metal is 4.1mL / 100g, which complies with the requirement of an ultra low hydrogen standard.
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Description

technical field

[0001] The invention belongs to the field of welding in material processing engineering, and the invention is mainly applied to the welding of WB36 steel. Background technique

[0002] WB36 (15NiCuMoNb5) steel is developed by adding Ni-Cu-Mo alloy on the basis of carbon-manganese steel. The steel is characterized by high strength, the yield limit is about 30% to 40% higher than that of St45.8 / III steel, and the allowable stress at 260°C is about 60% higher than that of St45.8 / III steel. The usual service temperature is 300°C Around, up to 400°C. It is widely used in high-pressure and boiling water areas of steam generators, water supply systems and steam drums. It can replace St45.8 / III, A106B, 20G and other steel types, reducing the wall thickness by about 15%~30%. It is a high-parameter power station And the ideal first-choice medium temperature material for utility boilers.

[0003] Since the first introduction of WB36 steel on the 600MW supercritical u...

Examples

Embodiment Construction

[0024] All embodiment welding rods are all made by common welding rod pressure coating machine:

[0025] 1. Choose Φ2.5 H08Mn2SiA as the steel core. Take 80 grams of ferromanganese, 55 grams of ferrosilicon, 15 grams of aluminum, 30 grams of nickel powder, 60 grams of quartz, 22 grams of ferro-niobium, 20 grams of ferro-vanadium, 20 grams of copper powder, 290 grams of fluorite, 408 grams of marble, a total of 1000 grams and 40 grams of water glass was put into the powder mixer and mixed for 10 minutes, then the mixed powder was added in the welding rod press coater. Pressed into electrodes, the welding process parameters are: electrode drying (°C h): 350×2; preheating temperature (°C): 120-150; interlayer temperature (°C): 200-250; welding current (A): 110~130; welding voltage (V): 25~28; post-weld heat treatment specification (℃ h): 600×2; heating rate (℃ / h): 100~120; cooling rate (℃ / h): 120~ 150. The results of mechanical properties are shown in Table 3, and the content ...