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A titanium alloy anchor chain for ships and ocean engineering and its welding production process

A technology of marine engineering and production technology, applied in welding equipment, welding accessories, electron beam welding equipment, etc., can solve the problems of end stress concentration affecting the service life of the anchor chain, reducing the strength of the anchor chain, affecting the strength of the joint, etc. Lightweight and high-strength seawater corrosion resistance, improved connection quality, and guaranteed welding quality

Active Publication Date: 2021-11-30
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the existing technologies use steel anchor chains. However, with the development of marine engineering equipment, titanium alloys have been widely used in marine engineering because of their light weight, high strength, and corrosion resistance. There is an urgent application demand in the field of anchor chains. ; and the existing steel anchor chain production process, especially the forming welding and surface coating asphalt anti-corrosion treatment process is not suitable for titanium alloy anchor chain; The two ends of the alloy are directly facing each other horizontally, and the two ends are parallel; in the subsequent flash welding process, the upsetting force in the horizontal direction is directly applied to realize the welding of the ends. When performing flash welding in this way, due to the low elastic modulus of titanium alloy When the top distance is long, a large outward protrusion will occur during welding, which will cause the deformation of the entire anchor chain to increase. At the same time, there will be a large stress concentration at the end, which will affect the service life of the anchor chain. In addition, the titanium alloy flashes Due to the large heat input in the core of butt welding, a coarse primary α phase is produced, which affects the strength of the joint and reduces the service strength of the anchor chain. Flash butt welding is not suitable for the manufacture of titanium alloy anchor chains

Method used

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  • A titanium alloy anchor chain for ships and ocean engineering and its welding production process
  • A titanium alloy anchor chain for ships and ocean engineering and its welding production process
  • A titanium alloy anchor chain for ships and ocean engineering and its welding production process

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Experimental program
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Effect test

Embodiment 1

[0033] Step 1, blanking: select a high-strength titanium alloy rod with a diameter of 40mm as the raw material, the performance of the titanium alloy rod is 780MPa yield strength, 880MPa tensile strength, 12% elongation, and 35% reduction in area;

[0034] Step 2, heating: use a heating furnace to heat the titanium alloy rod coated with high-temperature anti-oxidation coating to 850°C, and keep it warm for 1 hour to ensure that the core of the titanium alloy rod is close to the surface temperature, so that the rod is completely heated;

[0035] Step 3, bending ring: bend the heated titanium alloy bar on the bending ring mechanism, set the bending mandrel at the two starting positions of the titanium alloy bar to be bent, and first bend the titanium alloy bar The mandrel is bent into a U-shape with a horizontal bottom, and then the two sides of the U-shape are bent around the bending mandrel in the middle, so that the two end faces of the titanium alloy rod are close to each oth...

Embodiment 2

[0043] Step 1, blanking: select a high-strength titanium alloy rod with a diameter of 30mm as the raw material, the performance of the titanium alloy rod is 820MPa yield strength, 900MPa tensile strength, 10% elongation, and 31% reduction in area;

[0044] Step 2, heating: use an induction coil to heat the titanium alloy bar coated with high-temperature anti-oxidation coating to 940°C, and keep it warm for 30 minutes to ensure that the core of the titanium alloy bar is close to the surface temperature, so that the bar is completely heated;

[0045] Step 3, bending ring: bend the heated titanium alloy bar on the bending ring mechanism, set the bending mandrel at the two starting positions of the titanium alloy bar to be bent, and first bend the titanium alloy bar The mandrel is bent into a U-shape with a horizontal bottom, and then the two sides of the U-shape are bent around the bending mandrel in the middle, so that the two end faces of the titanium alloy rod are close to each...

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Abstract

The invention relates to a titanium alloy anchor chain for ships and marine engineering and its welding production process. It uses high-strength titanium alloy rods as raw materials, adopts special bending and welding processes, and puts crosspieces before welding the chain links. Compared with the prior art, the production process of the present invention generally ensures the forming accuracy and welding quality of the anchor chain, avoids stress concentration, and at the same time hardens the surface of the anchor chain through thermal oxidation after welding, which can improve the wear resistance of the anchor chain, further The service life of the titanium alloy anchor chain during use is improved, and the anchor chain prepared by the process of the invention can meet the higher requirements of marine engineering.

Description

technical field [0001] The invention relates to the field of ships and ocean engineering, in particular to a titanium alloy anchor chain for ships and ocean engineering and a welding production process thereof. Background technique [0002] The anchor chain is the chain connecting the anchor and the hull or marine engineering equipment. With the development of marine resources, marine engineering equipment is constantly developing, and the demand for anchor chains in marine engineering is also increasing; the specifications and strength levels are higher. High-strength anchor chains are also being continuously developed and applied. The cross-sectional diameter of the welding joint of large-scale high-strength anchor chains is greater than 40mm, and the tensile strength of R4-grade anchor chains is required to be greater than 860Mpa. come higher. [0003] Anchor chains can be divided into cast anchor chains, forged anchor chains and welded anchor chains according to their p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/235B23K9/32B23K15/00B63B21/20B23K103/14
CPCB23K9/235B23K9/32B23K15/0033B23K15/0046B63B21/20B63B2021/203B23K2103/14
Inventor 宋德军高福洋孙奇孙建刚陶欢
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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