Large-caliber duplex stainless steel butt shielded welding device

A duplex stainless steel, shielded welding technology, applied in welding protection devices, welding equipment, welding accessories, etc., can solve the problems of high welding requirements of washing towers, inability to meet the design and use requirements of welding seams, etc. rate and weld quality, good promotion and application value, economical and practical effect

Inactive Publication Date: 2021-01-22
SHANGHAI DONGDING STEEL STRUCTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high requirements for the welding seam of the washing tower, the traditional double-sided welding pipe butt joint and welding method cannot meet the design and use requirements of the weld seam. Argon arc welding is the most economical option

Method used

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  • Large-caliber duplex stainless steel butt shielded welding device
  • Large-caliber duplex stainless steel butt shielded welding device
  • Large-caliber duplex stainless steel butt shielded welding device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The device of the invention is used to weld the large-caliber duplex stainless steel pipeline of the ship tail gas treatment device (washing tower).

[0036] see Figure 1 to Figure 3 , when the large-diameter pipes need to be butted, assemble the pipes 8 and 9, leave the area to be welded, and stick the inflatable short groove 21 and high-temperature-resistant tinfoil tape along the direction of the area to be welded.

[0037] Install the inert gas input part 1 and the inert gas outflow part 3 on both ends of the inflatable tank assembly 2, use tin foil tape to fix the gas inlet and outlet, and ensure the sealing and gluing, so as to achieve airtight and airtight filling of argon during the welding process Purpose.

[0038] The inert gas input part 1 includes a quick connector 7 and an inflatable leather tube 6 . The two ends of the inflatable leather tube 6 are respectively connected to the quick connector 7 and the gas source device for providing argon.

[0039]Th...

Embodiment 2

[0042] Example 2 welds the pipes used to build the scrubber. The schematic diagram of the washing tower is as follows: Figure 5 shown.

[0043] Choose a pipe with a total length of 10 meters, a pipe diameter of 2.5 meters, and a pipe whose maximum straightness is controlled within the range of -3.5 to +4mm for welding.

[0044] (1) Use tooling to assemble and fix the two sections of butt pipes to ensure that the misalignment of the pipe walls is within the qualified range, and then install the device of the present invention to ensure that one end is fed in and the other end is released. The gas used is 99.99% pure argon, and the gas outlet should be kept open. state, maintain the argon flow rate to form a relatively stable air pressure between the pipeline to be welded area 5 and the shielded welding device;

[0045] (2) The gas flow rate is >25L / min. When the welding wire is deposited in a liquid state, it flows to the back of the stroke to form. Since argon is an inert g...

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Abstract

The invention discloses a large-caliber duplex stainless steel butt shielded welding device. The large-caliber duplex stainless steel butt shielded welding device comprises an aeration tank assembly,an inert gas input part, an inert gas outflow part and a paste part, wherein the aeration tank assembly is used for wrapping the outer side of a back welding seam; the inert gas input part is connected with a first end of the aeration tank assembly; the inert gas outflow part is connected with a second end of the aeration tank assembly; the paste part is used for bonding the aeration tank assemblyto the back surface of a to-be-welded plate; the aeration tank assembly is composed of a plurality of short aeration tanks connected end to end; the aeration tank assembly is matched with the shape of the back surface of the to-be-welded plate; a space through which an inert gas flows is formed between the interior of the aeration tank assembly and the back surface of the to-be-welded plate; andthe inert gas is input into the aeration tank assembly through the inert gas input part and flows out through the inert gas outflow part. The device is provided with an air outlet, so that the problemthat the pressure formed in the sealed space is too large easily is solved, deposited metal of a welding wire can flow to the back surface more easily to be formed when deposited metal is in a liquidstate, and the welding reliability and the mechanical property of the welding seam are improved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a large-diameter duplex stainless steel butt protection welding device. Background technique [0002] IMO MEP C70 (the 70th meeting of the Marine Environment Protection Committee of the International Maritime Organization, October 2016) decided to further reduce the global sulfur emission limit to 0.5%, and reduce the sulfur content of fuel oil from 3.5% to 0.5% globally, and in 2020 It will come into effect on January 1, 2020, requiring that ships that fail to meet the emission standards will be restricted from operating from March 1, 2020. [0003] Due to the scarcity of low-sulfur crude oil sources, limited production capacity, and high prices, many ship operators are discouraged. The use of LNG-powered ships requires a large hull space for storage, and the cost is high, making many ships tend to use emission requirements and low cost. , Easy to install, and a short return o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/32
CPCB23K9/16B23K9/321
Inventor 赵升平
Owner SHANGHAI DONGDING STEEL STRUCTURE
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