Unlock instant, AI-driven research and patent intelligence for your innovation.

Flux-cored wire for submerged-arc welding of low-temperature steel LPG ship

A technology of submerged arc welding and low-temperature steel, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc. It can solve the problems of not meeting the performance requirements of LPG ship welding, not describing the impact performance, and difficult processing and manufacturing. Achieve the effects of low alloy composition content, easy slag removal and low processing cost

Active Publication Date: 2019-05-31
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
View PDF9 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Currently retrieved domestic related patents include: (1) low temperature steel flux-cored welding wire (public number: CN101850484A), the average value of the impact energy of the welding wire deposited metal at -40°C can reach 80J, but there is no description of lower temperature impact properties, and some LPG marine low-temperature steels in actual work are required to meet the low-temperature toughness of -70℃~-75℃; (2), low-temperature steel submerged arc welding The composition contains more precious metal molybdenum, and the cost is higher; (3), a high-strength submerged arc welding wire with excellent low-temperature toughness (publication number: 103418934A), the welding wire proposed in this patent is a solid welding wire, and its alloy composition is relatively high. Manufacturing is more difficult
[0005] Therefore, although the current relevant patents introduce several low-temperature steel flux-cored welding wires and their proportions, they all have deficiencies, and some of them cannot meet the performance requirements of welding LPG ships under low-temperature conditions.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] Among the present invention, the steel strip method is adopted to prepare flux-cored welding wire for submerged arc welding of low-temperature steel LPG ship, and its preparation method mainly includes the following steps:

[0036] (1), drying each component of the powder drug core, and mixing uniformly according to the above ratio to obtain the powder drug core;

[0037] (2), Utilize the forming roll to roll the SPCC steel strip into a U shape, and then add the powder core into the U-shaped groove according to 20-25% of the total weight of the welding wire through the powder feeding device;

[0038] (3) Close the U-shaped groove, wrap the powder flux core in it, pass through the wire drawing die, draw and reduce the diameter one by one, and obtain the flux-cored welding wire.

[0039] It should be noted that the preparation method of the flux-cored wire for the submerged arc welding of the low-temperature steel LPG ship is not limited to the steel strip method.

[004...

Embodiment 1

[0045]A flux-cored welding wire for submerged arc welding of low-temperature steel LPG ships, which is composed of an SPCC steel strip sheath and a powder flux core, wherein the powder flux core includes the following components: 0.4% graphite, 1% ferrosilicon, 6 % manganese metal, 10% nickel metal, 4% ferro-titanium, 0.4% ferro-boron, 0.3% magnesium powder, 0.3% cerium fluoride, 77.6% iron powder.

[0046] Sieve and dry the above-mentioned components, and mix them uniformly according to the above ratio to obtain a powder core; use a forming roll to roll the SPCC steel strip into a U shape, and then use a powder feeding device to feed the powder core according to 20% of the total weight of the welding wire. % into the U-shaped groove; close the U-shaped groove, wrap the powder flux core in it, pass through the wire drawing die, draw and reduce the diameter one by one, and obtain a flux-cored welding wire with a diameter of 3.2mm.

Embodiment 2

[0048] A low-temperature steel flux-cored welding wire for LPG ship submerged arc welding, which is composed of an SPCC steel strip sheath and a powder flux core, wherein the powder flux core includes the following components: 0.3% graphite, 0.8% ferrosilicon, 4% manganese metal, 8% nickel metal, 3% ferro-titanium, 0.3% ferro-boron, 0.4% magnesium powder, 0.2% cerium oxide, 83% iron powder.

[0049] Sieve and dry the above-mentioned components, and mix them uniformly according to the above ratio to obtain a powder core; use a forming roll to roll the SPCC steel strip into a U shape, and then use a powder feeding device to feed the powder core according to 25% of the total weight of the welding wire. % into the U-shaped groove; close the U-shaped groove, wrap the powder flux core in it, pass through the wire drawing die, draw and reduce the diameter one by one, and obtain a flux-cored welding wire with a diameter of 3.2mm.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
tensile strengthaaaaaaaaaa
diameteraaaaaaaaaa
strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a flux-cored wire for submerged-arc welding of a low-temperature steel LPG ship, and belongs to the technical field of welding materials. The flux-cored wire is composed of steel skin and a powder body flux core, and the powder body flux core is composed of, by mass, 0.2-0.4% of graphite, 0.5-1% of silicon iron, 3-6% of manganese, 6-10% of nickel, 2-4% of ferrotitanium, 0.1-0.4% of ferroboron, 0.2-0.5% of magnesium powder, 0.1-0.4% of rare earth and the balanced iron powder and unavoidable impurities. The flux-cored wire prepared by adopting the powder body flux core proportion has the advantages that the cladding metal mechanical performance is stable, the strength is greater than 690 MPa, the -75 DEG C impact energy is greater than 80 J, and the demands of the submerged-arc welding of the low-temperature steel LPG ship can be met.

Description

technical field [0001] The invention relates to the technical field of welding materials, in particular to a flux-cored welding wire for submerged arc welding of low-temperature steel LPG ships. Background technique [0002] At present, the global demand for new energy is increasing day by day. Liquefied petroleum gas (LPG) is known as a clean green energy because of its high combustion value and almost no pollution to the atmosphere. With the development, the demand for transportation LPG ships and LPG cryogenic storage tanks is growing rapidly. Submerged arc welding has become a common method for LPG ship welding due to its high welding efficiency and good welding quality. The working environment of low-temperature steel LPG ships can reach -40℃~-60℃, so low-temperature steel welding consumables are mainly used for welding. However, at present, such welding consumables are mainly imported from abroad, and domestic welding consumables are limited in use. [0003] In order ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40
Inventor 付红亮王志银姚润钢
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP