CN103111737A - R5 mooring chain end ring flash butt welding process - Google Patents
R5 mooring chain end ring flash butt welding process Download PDFInfo
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- CN103111737A CN103111737A CN 201110365411 CN201110365411A CN103111737A CN 103111737 A CN103111737 A CN 103111737A CN 201110365411 CN201110365411 CN 201110365411 CN 201110365411 A CN201110365411 A CN 201110365411A CN 103111737 A CN103111737 A CN 103111737A
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- butt welding
- flash butt
- mooring chain
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- chain end
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Abstract
A type of R5 mooring chain end ring flash butt welding process includes the steps of clamping, preheating, flashing, upset forging and cooling. The R5 mooring chain end ring flash butt welding process ensures that the welding performance of an R5 mooring chain end ring with the diameter of 137 millimeters meets the requirements of classification society rules, and guarantees the mechanical properties of an R5 mooring chain.
Description
Technical field:
The present invention relates to a kind of marine mooring chain, particularly relate to a kind of flash butt welding technique of 137mm R5 mooring cable end-rings.
Background technology:
Marine mooring chain is widely used in the large ocean engineering structure, is the chain that guarantees the life used safely under abominable open ocean.Along with ocean engineering develops to the deep-sea, all kinds of facilities are also more and more higher to the requirement of mooring cable performance.Improve the bearing load of mooring cable, the one, the specification of raising chain, the 2nd, the strength grade of raising chain.But although marine facility is tending towards maximizing, specialization, yet the expansion of anchor chain diameter is limited by the restriction of factors, often needs the more mooring cable of high intensity levels, overcomes the impact that the unfavorable conditions such as severe sea condition brings.Mooring cable can be divided into the R3 level according to tensile strength, the R3S level, and the R4 level, its chain link intensity after Overheating Treatment is respectively 690MPa, 770MPa, 860MPa.But these products can not satisfy the needs of ocean engineering development fully, and therefore, more high-intensity R5 level mooring cable arises at the historic moment.
The up-to-date ABS(2009 of American Bureau of Shipping version) and the DNV-OS-E302(2008 of Norske Veritas version) the mooring cable regulation and stipulation mechanical property of R5 mooring cable, require its yield tensile ratio≤0.92, and slow strain rate tension is measured SCC(stress corrosion cracking (SCC)) and HE (hydrogen embrittlement), the most advanced and sophisticated crack displacement of CTOD(is tested) etc. the additional testing requirement.Improve the intensity of chain link, generally can be by adjusting material composition or adjusting tempering process and realize.But reduce temperature, yield tensile ratio is improved, also will produce temper brittleness and cause that toughness descends, and classification society rule's clear temperature must not be less than 570 ℃, so the method is also improper.If use the method for adding alloying element, need the strict content of controlling each dvielement, yet even so, still inevitably can improve the carbon equivalent Ceq of R5 mooring chain steel, increase the difficulty of Flash Butt Welding.
Because mooring cable is had relatively high expectations to performance uniformity, the defective of any ring all might cause whole chain to lose efficacy, and therefore requires the performance of whole pitch chain to have high uniformity and super narrow strength range 1010-1050Mpa.Yet along with alloying element content in steel increases, the elevated temperature strength of material generally will increase, and these welding qualities have a great impact, and therefore how to select best welding condition in narrow strength range, making the R5 mooring cable have better mechanical property is the work that technical difficulty is larger
Summary of the invention:
The purpose of this invention is to provide and a kind ofly guarantee that the chain link welding performance satisfies the flash butt welding technique of the Φ 137mm R5 level mooring cable end-rings that classification society requires.
The object of the present invention is achieved like this, and a kind of flash butt welding technique of R5 mooring cable end-rings is characterized in that comprising the following steps: clamping, and------flash of light---upset---is cooling in preheating.
Flash Butt Welding parameter of the present invention is: the amount of burning: 40mm, and the top is long: 35mm, burn speed: 1.2mm/s, secondary idle load voltage: 18V.
The present invention has guaranteed that the welding performance of Φ 137mm R5 level mooring cable end-rings meets classification society rule's requirement, has guaranteed the mechanical property of R5 mooring cable.
The specific embodiment:
A kind of flash butt welding technique of R5 mooring cable end-rings is characterized in that comprising the following steps: clamping, and------flash of light---upset---is cooling in preheating.Flash Butt Welding parameter of the present invention is: the amount of burning: 40mm, and the top is long: 35mm, burn speed: 1.2mm/s, secondary idle load voltage: 18V.The Flash Butt Welding parameter of Φ 137mmR5 mooring cable end-rings (diameter is Φ 164): when the choosing of the amount of the burning process that must guarantee to burn finishes, can guarantee homogeneous heating on two end faces of weldment, produce enough molten metal layer, simultaneously reach plastic deformation temperatures on certain depth, could obtain like this joint of high-quality in upset.The R5 mooring chain steel contains more Mo element and a small amount of V, Nb, and the trace elements such as Ti, these elements can significantly improve the elevated temperature strength of material, but can produce enough plastic deformations when guaranteeing upset, need the suitably increase amount of burning, and prolongation are burnt the time.When the upset amount is less, have liquid metal and remain in interface, easily form loose, shrinkage cavity, crackle, cast sturcture, greyness, oxide inclusion, the defective such as lack of penetration, joint mechanical property is reduced, thereby the impact value that obtains is lower; The meeting bigger than normal of upset amount squeezes out too much plastic metal, increase to remove the difficulty of joint burr, also can because of the joint part tear and crystallized seriously crooked, reduce the impact toughness of joint.Can the relation of choosing of speed of welding the Flash Butt Welding process and be carried out smoothly, only chosen the strong and stable of suitable speed of welding guarantee flash of light, and obtained best heating effect.The thermal efficiency when selection of secondary idle load voltage can have influence on output power of power supply and welding.By test as can be known, in the time of the secondary idle load brownout, glisten unstable, the weldment short circuit easily occurs and ends to glisten; The secondary idle load overtension can stay darker fiery pit on end face, and can't seal fully during upset, easily produces the defectives such as slag inclusion, shrinkage cavity, affects joint quality.
Claims (2)
1. the flash butt welding technique of a R5 mooring cable end-rings is characterized in that comprising the following steps: clamping, and------flash of light---upset---is cooling in preheating.
2. the flash butt welding technique of a kind of R5 mooring cable end-rings according to claim 1, it is characterized in that: the Flash Butt Welding parameter is: the amount of burning: 40mm, the top is long: 35mm, burn speed: 1.2mm/s, secondary idle load voltage: 18V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110365411 CN103111737A (en) | 2011-11-17 | 2011-11-17 | R5 mooring chain end ring flash butt welding process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110365411 CN103111737A (en) | 2011-11-17 | 2011-11-17 | R5 mooring chain end ring flash butt welding process |
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| Publication Number | Publication Date |
|---|---|
| CN103111737A true CN103111737A (en) | 2013-05-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110365411 Pending CN103111737A (en) | 2011-11-17 | 2011-11-17 | R5 mooring chain end ring flash butt welding process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105880817A (en) * | 2016-05-30 | 2016-08-24 | 江苏亚星锚链股份有限公司 | Flash welding technology for R6 level mooring cable ordinary ring |
| CN109773317A (en) * | 2018-12-11 | 2019-05-21 | 江苏亚星锚链股份有限公司 | A kind of Flash Butt Welding technique of R6 grades of mooring cable end-rings |
| CN114131163A (en) * | 2021-08-25 | 2022-03-04 | 江阴兴澄特种钢铁有限公司 | Process method for improving quality of mooring cable welded junction |
-
2011
- 2011-11-17 CN CN 201110365411 patent/CN103111737A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105880817A (en) * | 2016-05-30 | 2016-08-24 | 江苏亚星锚链股份有限公司 | Flash welding technology for R6 level mooring cable ordinary ring |
| WO2017206463A1 (en) * | 2016-05-30 | 2017-12-07 | 陶安祥 | Flash welding process for common link of grade r6 mooring chain |
| CN109773317A (en) * | 2018-12-11 | 2019-05-21 | 江苏亚星锚链股份有限公司 | A kind of Flash Butt Welding technique of R6 grades of mooring cable end-rings |
| CN114131163A (en) * | 2021-08-25 | 2022-03-04 | 江阴兴澄特种钢铁有限公司 | Process method for improving quality of mooring cable welded junction |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130522 |