Carbon steel electrode for welding SA516 Gr.70 carbon steel plate, and preparation method thereof

A sa516gr.70, welding rod technology, applied in welding equipment, welding medium, welding/cutting medium/material, etc., can solve the problems of welding rod spatter, large slag removal, etc., and achieve excellent strength and toughness matching, uniform coverage, and good weld resistance. cracking effect

CN109093280APending Publication Date: 2018-12-28SHANGHAI ATLANTIC WELDING CONSUMABLES
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-12-28

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Abstract

The invention relates to the technical field of electrodes and preparation methods thereof, in particular to a carbon steel electrode for welding an SA516Gr.70 carbon steel plate, and a preparation method thereof. The carbon steel electrode comprises a core wire, an electrode coating and a binder. The material component of the electrode coating is powder, wherein the weight ratio of the powder tothe electrode is (35-45):100, the weight ratio of the powder to the binder is 100:(20-30), and the rest is the core wire. The components in the electrode coating comprise, by weight, 3-8% of rutile powder, 25-40% of marble powder, 15-30% of fluorite powder, 3-5% of electrolytic manganese, 2-8% of spray silicon iron, 0.2-1.0% of ferromolybdenum, 20-30% of reduced iron powder, 0.1-0.4% of graphite,0.2-0.8% of CMC and 0.3-1.0% of sodium carbonate. The carbon steel electrode has the advantages that electrical arc stability and molten bath liquidity are good, and molten slag shells evenly cover; deslagging is easy; and weld joints are formed flatly.
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Description

technical field

[0001] The invention relates to the technical field of welding rods and preparation methods thereof, in particular to a carbon steel welding rod for welding SA516 Gr.70 carbon steel plates and a preparation method thereof. Background technique

[0002] SA516 Gr.70 fully meets the needs of oil and gas with high sulfur and hydrogen content, reduces the corrosion of sulfur and hydrogen, reduces the maintenance of equipment, and increases the service life of equipment. The steel plate has good impact resistance, small temperature deformation, good welding performance, good fatigue resistance, good anti-lamination cracking performance, microalloying, high purity, low carbon equivalent and strong hydrogen sulfide resistance. SA516 Gr.70 is widely used in petroleum, chemical industry, power station, boiler and other industries to make reactors, heat exchangers, separators, spherical tanks, gas tanks, liquefied gas tanks, nuclear reactor pressure shells, boiler drums...

Examples

Embodiment 1～3

[0019] The present invention provides a carbon steel welding rod for welding SA516 Gr.70 carbon steel plates. The high-quality H08A carbon steel welding core with a diameter of Φ4.0mm is selected, and its specific chemical composition is shown in Table 1;

[0020] The concrete chemical composition of the welding core of table 1 present embodiment electrode compares (weight %)

[0021] C

S

mn

Si

P

Cr

Ni

Cu

As

0.055

0.008

0.46

0.01

0.005

0.01

0.01

0.01

0.01

[0022] (1) get various ingredients and mix homogeneously by the components and percentages shown in Table 2;

[0023] (2) Use potassium sodium mixed water glass with Baume concentration of 43° as the binder, the weight ratio of powder to binder is 100:20, stir and mix evenly; send the mixed material and H08A carbon steel welding core into the plodder Inside, wrap it on the H08A carbon steel welding core according to the conventional method;

[0024] (...