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A marine low-speed engine valve plate bottom and its welding process

A welding process and low-speed machine technology, applied in welding equipment, lift valves, valve devices, etc., can solve problems such as unsatisfactory surfacing and poor alloy fusion, and achieve high welding efficiency, stable quality, and safety.

Active Publication Date: 2019-07-09
NANJING INT MARINE EQUIP & SPARES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to propose a marine low-speed machine gas valve disc bottom and its welding process, which can solve the defects of insufficient overlay welding and poor alloy fusion, improve the production process of the gas valve, and prolong the life of the gas valve. valve service life

Method used

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  • A marine low-speed engine valve plate bottom and its welding process
  • A marine low-speed engine valve plate bottom and its welding process
  • A marine low-speed engine valve plate bottom and its welding process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Firstly, the diesel engine valve blank of SNCrW and the welding wire of solid-solution-strengthened nickel-based deformed superalloy material are selected. Among them, the composition of the center hole of the diesel engine valve disc bottom is: C: 0.25%, Si: 0.90%, Mn: 0.90%, P≤0.04%, S≤0.03%, Ni: 9.0%, Cr: 18.0%, W : 1.8%, Nb≤0.1%, B: 0.001%, N: 0.04%, and the balance is Fe; the welding wire is Inconel625 material with molybdenum and niobium as the main strengthening elements, and its diameter is 1.0mm. And choose the mixed gas of Ar / 15He as the welding shielding gas, the mixing ratio of the shielding gas is 85% Ar, 15% He.

[0021] According to the shape of the center hole at the bottom of the valve disc, it is divided into a straight hole section and an inclined hole section. like figure 1 As shown, in the straight hole section, d1=11mm, h1=7mm, in the inclined hole section, d2=21mm, h2=12mm.

[0022] Secondly, because in a high-temperature environment, nickel is...

Embodiment 2

[0030] Firstly, the diesel engine valve blank of SNCrW and the welding wire of solid-solution-strengthened nickel-based deformed superalloy material are selected. Among them, the composition of the center hole of the diesel engine valve plate bottom is: C: 0.28%, Si: 0.95%, Mn: 0.95%, P≤0.04%, S≤0.03%, Ni: 10.0%, Cr: 19.0%, W : 2.0%, Nb≤0.1%, B: 0.0015%, N: 0.06%, and the balance is Fe; the welding wire is Inconel625 material with molybdenum and niobium as the main strengthening elements, its diameter is 1.1mm, and Ar / The mixed gas of 15He is used as the welding shielding gas, and the mixing ratio of the shielding gas is 85% Ar, 15% He.

[0031] According to the shape of the center hole at the bottom of the valve disc, it is divided into a straight hole section and an inclined hole section. like figure 1 As shown, in the straight hole section, d1=11mm, h1=7mm, in the inclined hole section, d2=21mm, h2=12mm.

[0032]Secondly, because in a high-temperature environment, nicke...

Embodiment 3

[0040] Firstly, the diesel engine valve blank of SNCrW and the welding wire of solid-solution-strengthened nickel-based deformed superalloy material are selected. Among them, the composition of the center hole of the diesel engine valve plate bottom is: C: 0.27%, Si: 0.95%, Mn: 0.95%, P≤0.04%, S≤0.03%, Ni: 9.5%, Cr: 20.0%, W : 2.1%, Nb≤0.1%, B: 0.002%, N: 0.075%, and the balance is Fe; the welding wire is Inconel625 material with molybdenum and niobium as the main strengthening elements, its diameter is 1.2mm, and Ar / The mixed gas of 15He is used as the welding shielding gas, and the mixing ratio of the shielding gas is 85% Ar, 15% He.

[0041] According to the shape of the center hole at the bottom of the valve disc, it is divided into a straight hole section and an inclined hole section. like figure 1 As shown, in the straight hole section, d1=11mm, h1=7mm, in the inclined hole section, d2=21mm, h2=12mm.

[0042] Secondly, because in a high-temperature environment, nicke...

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Abstract

The invention discloses an air valve plate bottom of a marine low-speed machine and a welding process of the air valve plate bottom. The air valve plate bottom is provided with a central hole; a base material of the central hole is a SNCrW material containing the following chemical components: C, Si, Mn, P, S, Ni, Cr, W, Nb, B, N and the balance of Fe. According to the shape of the central hole, the central hole of the air valve plate bottom is divided into two sections: a straight hole section and an inclined hole section; for different shapes of the central hole, a welding procedure is divided into a welding phase I and a welding phase II. According to the air valve plate bottom of the marine low-speed machine and the welding process of the air valve plate bottom, a welding gun is tilted to a certain angle, and then swung to make welding alloy well fused with the base material, to guarantee full welding of the central hole; furthermore, by the use of a six-axis industrial robot and an MIG welding machine, full-automatic welding is realized, the welding efficiency is high, and the quality is stable.

Description

technical field [0001] The invention relates to a gas valve disc bottom and its welding process, in particular to a marine low-speed engine gas valve disc bottom and its welding process, belonging to the technical field of gas valve welding. Background technique [0002] The exhaust valve is a key part of the marine low-speed engine. At present, there are integral Nimonic 80A air valves and duraspindle air valves with bimetallic welding between the bottom of the disc and the valve surface in the domestic market. Among them, the duraspindle air valve not only has Inconel 625 cladding and welding on the bottom of the plate, but also has Inconel 718 on the valve surface, which reduces the manufacturing cost, prolongs the overhaul time of the exhaust valve, and has considerable social and economic benefits. However, due to the central hole that must exist at the bottom of the disc during the machining process of the gas valve, it has considerable requirements for the surfacing p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L3/02
CPCB23K9/022B23K9/095B23K9/164B23K9/173B23K9/235C22C38/001C22C38/02C22C38/04C22C38/44C22C38/48C22C38/54
Inventor 贾连军衷爱东佟常兵赵大忠鲍海波胡期翔鲁宏陈文彬
Owner NANJING INT MARINE EQUIP & SPARES
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