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Low-alloy-steel welding rod for welding of maritime work rack steel Q690

A technology of low-alloy steel and rack steel, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc. It can solve the problems of insufficient impact energy margin, unstable welding process arc, and high strength, and achieve slag removal Good performance, smooth electrode surface and excellent welding performance

Active Publication Date: 2017-09-05
SHANGHAI ATLANTIC WELDING CONSUMABLES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing Mn-Ni-Cr-Mo system electrode used for welding 85kg low-alloy steel structures has high strength and insufficient impact energy margin at -40°C. In addition, the arc is not stable enough in the welding process

Method used

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  • Low-alloy-steel welding rod for welding of maritime work rack steel Q690
  • Low-alloy-steel welding rod for welding of maritime work rack steel Q690
  • Low-alloy-steel welding rod for welding of maritime work rack steel Q690

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In the embodiment of the present invention, a low-alloy steel electrode used for welding marine rack steel Q690 is composed of a welding core and a coating.

[0032] Take the powder of each component of the drug skin: 400g of marble, 190g of fluorite, 40g of silicon micropowder, 35g of rutile, 100g of iron powder, 5g of CMC, 5g of soda ash, 6.5g of alginate, 86g of a mixture of manganese alloy, chromium alloy and molybdenum alloy, nickel Powder 60g.

[0033] After mixing the above powders evenly, add 190g of potassium sodium water glass with a concentration of 42°, stir and mix evenly, send it into the bar press and wrap it on the high-quality solder core with low S and P content according to the conventional method, and then pass Baking at a low temperature of 95°C for 2 hours and a high temperature of 360°C for 1.5 hours, the low-alloy steel electrode is obtained.

[0034] Adopt 155-165A current, adopt the test plate whose base material is Q345B with a plate thicknes...

Embodiment 2

[0042] In the embodiment of the present invention, a low-alloy steel electrode used for welding marine rack steel Q690 is composed of a welding core and a coating.

[0043] Get the powder of each component of the drug skin: 480g of marble, 160g of fluorite, 30g of silicon micropowder, 50g of rutile, 80g of iron powder, 6g of CMC, 6g of soda ash, 6g of alginate, 79g of manganese, chromium and molybdenum alloy mixture, and 64g of nickel powder.

[0044]After mixing the above powders evenly, add 210g of potassium sodium water glass with a concentration of 42°, stir and mix evenly, send it into the bar press and wrap it on the high-quality solder core with low S and P content according to the conventional method, and then pass Baking at a low temperature of 95°C for 2 hours and a high temperature of 360°C for 1.5 hours, the low-alloy steel electrode is obtained.

[0045] Adopt 155-165A current, adopt the test plate whose base material is Q345B with a plate thickness of 20mm, the g...

Embodiment 3

[0052] In the embodiment of the present invention, a low-alloy steel electrode used for welding marine rack steel Q690 is composed of a welding core and a coating.

[0053] Get each component powder of the drug skin: marble 450g, fluorite 220g, silicon micropowder 30g, rutile 40g, iron powder 60g, CMC 4g, soda ash 6g, alginate 6g, manganese, chromium, molybdenum alloy mixture 85g, nickel powder 66g.

[0054] After mixing the above powders evenly, add 230g of potassium sodium water glass with a concentration of 42°, stir and mix evenly, send it into the bar press and wrap it on the high-quality solder core with low S and P content according to the conventional method, and then pass Baking at a low temperature of 95°C for 2 hours and a high temperature of 360°C for 1.5 hours, the low-alloy steel electrode is obtained.

[0055] Adopt 155-165A current, adopt the test plate whose base material is Q345B with a plate thickness of 20mm, the groove of the test plate is 10°, and the edg...

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Abstract

The invention discloses a low-alloy-steel welding rod for welding of maritime work rack steel Q690. The low-alloy-steel welding rod comprises welding core and a coating. The coating comprises the following raw materials of, by mass, 15%-25% of fluorite, 2%-5% of silicon micro powder, 3%-6% of rutile, 6%-12% of iron powder, 0.3%-0.7% of CMC, 0.5%-0.8% of sodium carbonate, 0.5%-0.7% of alginate, 7%-10% of a mixture of manganese alloy, chromium alloy and molybdenum alloy, 6%-7% of nickel powder, and the balance marble. The welding core comprises the following components of, by mass, 0-0.10% of C, 0.35%-0.60% of Mn, 0-0.03% of Si, 0-0.20% of Cr, 0-0.30% of Ni, 0-010% of S, 0-0.015% of P, 0-0.20% of Cu, and the balance Fe and unavoidable impurities. The low-alloy-steel welding rod meets the chemical component requirements of matching of the maritime work rack steel Q690 and the low-alloy-steel welding rod, deposited metal keeps high strength, low-temperature impact toughness is improved, the surface of the welding rod is smooth, the yield is high, eccentricity is stable, and all-position welding performance of the welding rod is good.

Description

technical field [0001] The invention relates to welding materials, in particular to a low-alloy steel welding rod used for welding marine engineering rack steel Q690. Background technique [0002] The rack steel of pile legs of marine engineering equipment is of large thickness, the maximum thickness can reach 210mm, and the material has excellent lamellar tear resistance. Therefore, corresponding requirements are put forward for the lamellar tear resistance of the welded joints. In order to ensure the lamellar tear resistance of the joints, the S and P content of the matching welding consumables is required to be as low as possible; in addition, when the pile legs are assembled and welded on site , the working environment is relatively harsh, and the atmospheric humidity is very high. Strict requirements are placed on controlling the diffused hydrogen of the joints, and the hydrogen content of the supporting welding materials must be strictly controlled. [0003] The mecha...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/365
CPCB23K35/0272B23K35/3066B23K35/3602B23K35/365
Inventor 胡晓雯刘畅
Owner SHANGHAI ATLANTIC WELDING CONSUMABLES
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