CN102990248B

CN102990248B - A kind of invar welding special welding wire

Info

Publication number: CN102990248B
Application number: CN201210425831.4A
Authority: CN
Inventors: 高金菊
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-10-31
Filing date: 2012-10-31
Publication date: 2015-12-02
Anticipated expiration: 2032-10-31
Also published as: CN102990248A

Abstract

The invention discloses a kind of invar welding special welding wire, belong to field of welding material.This invar welding special welding wire component and mass fraction are: Ni is 51%-53.5%, C content is determined according to the content of Ni, the mass fraction of C equals 14.5% of Ni, Mn is 1.7-1.9%, S≤0.0015%, P≤0.011%, Si is 1.0-1.4%, yttrium race rare earth 1-2%, V are 0.13-0.14%, and surplus is Fe.The weld seam adopting invar of the present invention to weld the invar steel of special welding wire welding has the advantage that thermal coefficient of expansion is low, cryogenic property is good.

Description

A kind of invar welding special welding wire

Technical field

The invention belongs to field of welding material, more particularly, relate to a kind of invar welding special welding wire.

Background technology

Can LNG ship is called as in inercant ships builds the ship that difficulty is the highest, gold content is maximum, build LNG ship and often represent a national shipbuilding level height.Difficult point maximum in LNG ship building course is the freight house in ship, cost when LNG ship is built has half to be used on freight house, because the freight house transport of LNG ship is liquefied natural gas, need the low temperature bearing-163 °, so the main material of the freight house of LNG ship adopts the invar film solder of 0.5-1.5mm thickness to form, the invar film (also referred to as invar steel) of the most frequently used is 0.7mm.Invar steel contains the nickel of 36%, and this is the material of one very " enervated ", touches water or oil, will get rusty within 8h, and due to invar steel plate thickness only 0.7mm, once get rusty, all will scrap for whole under normal temperature.The solder technology of invar steel becomes LNG ship and builds the key problem in technology that must capture.Because invar steel thickness is little of 0.7inm, adopt TIG/MIG welding method at present, very high to the competency profiling of welder.Meanwhile, require also higher to operating environment.All layer of plastic film protected is covered before general invar steel dispatches from the factory; often roll up and all use plastic bag sealing; be contained in wooden case; LNG ship job site must be equipped with the air-conditioning with dehumidification function; except being supplied to the fresh air of constructor 25%, also to ensure that whole cabin inner drying degree remains on more than 60%.Even under such circumstances, touch unintentionally oil or water, invar steel also can get rusty in 24h, must wear rubber gloves when therefore workpeople constructs.The composition of invar steel sees the following form:

The composition (% by weight) of invar steel

C

Si

S

Mn

Ni

P

Fe

≤0.04

≤0.25

≤0.0015

≤0.2

35-36.5

≤0.008

Surplus

Domesticly at present there is no invar steel production capacity, existing disclosed document is all the research to its welding procedure.There is not yet the research of the welding wire to welding invar steel.China Patent No. 201010177564.4, publication date on November 03rd, 2010, disclose the patent document that a name is called a kind of assembling and welding process of the invar pipe on LNG carrier, this invention relates to a kind of assembling and welding process of the invar pipe on LNG carrier, and the method comprises the steps: No. three plates and No. six plates of 1. first fixing invar pipe; 2. the positioner 90 ° that turns clockwise an assembling plate, No. seven plates and No. eight plates form Article 1 weld seam band; 3. at No. six plates, form Article 2 weld seam band between No. seven plates and No. eight plates; 4. the Article 3 weld seam band of positioner 180 ° assembling No. two plates, No. four plates and No. five plate formation invar pipes is rotated counterclockwise; 5. at No. two plates, form Article 4 weld seam band between No. three plates and No. four plates; 6. No. nine plates of erection welding invar pipe; 7. the termination of invar pipe is fixed to prepare welding; 8. utilize manual five welding regions welding invar pipe respectively, complete the welding equipment work of invar pipe.The method of this invention has welding equipment steady quality for prior art, the advantage that welding equipment efficiency is high.This invention is also in the improvement of research welding procedure, does not propose better welding material to weld invar steel.And invar steel lacks better welding wire to weld, the existing invar special welding wire from external import is high to welding process requirement, there is the problem that thermal coefficient of expansion is high.

Summary of the invention

The problem that 1, will solve

For the welding existence welding difficulty of prior art for invar steel, require high to process conditions, the problem that thermal coefficient of expansion is high, the invention provides a kind of invar welding special welding wire, be specifically designed to and weld invar steel, the thermal coefficient of expansion of weld seam is low.

2, technical scheme

For solving the problem, the technical solution used in the present invention is as follows.

A kind of invar welding special welding wire, its component and mass fraction are: Ni is 51%-53.5%, C content is determined according to the content of Ni, and it is 1.7-1.9% that the mass fraction of C equals 0.145%, Mn of Ni, S≤0.0015%, P≤0.011%, Si is 1.0-1.4%, yttrium race rare earth 1-2%, V is 0.13-0.14%, and surplus is Fe.

Further, described Ni is 52.3%, C be 0.076%, Mn is 1.85%, S≤0.0015%, and P≤0.011%, Si is 1.0%, yttrium race rare earth 1.3%, and surplus is Fe.During this combination, thermal coefficient of expansion is minimum.

3, beneficial effect

Compared to prior art, beneficial effect of the present invention is:

(1) the present invention adopts component and mass fraction to be: Ni is 51-53.5%, and C content is determined according to the content of Ni, and the mass fraction of C equals 0.145% of Ni, Mn is 1.7-1.9%, S≤0.0015%, P≤0.011%, Si is 1.0-1.4%, yttrium race rare earth 1-2%, V is 0.13-0.14%, and surplus is Fe, when this composition proportion adopts Tig to weld invar steel, the thermal coefficient of expansion of weld seam is low, and welding process requirement is low;

(2) Ni of the present invention is 51%-53.5%, C content is determined according to the content of Ni, the mass fraction of C equals 0.145% of Ni, be to obtain single phase austenite, the thermal conductivity coefficient of austenite structure is lower, dispels the heat relatively mild, not yielding during welding, reduce because of the uneven thermal stress caused of expanding with heat and contract with cold, avoid melt run to occur hard crisp martensite belt, that guarantees obtains the low weld seam of thermal coefficient of expansion;

(3) effect of Mn of the present invention is mainly as deoxidier, is also simultaneously the important alloying constituent of weld metal;

(4) Main Function of yttrium race of the present invention rare earth is the purification of Resistance of Weld Metal and improves crystal habit, improves weld seam low-temperature flexibility.

Detailed description of the invention

Describe the present invention below in conjunction with specific embodiment.

Embodiment 1

A kind of invar welding special welding wire, its component and mass fraction are: Ni is 52.3%, C be 0.076%, Mn is 1.85%, S≤0.0015%, and P≤0.011%, Si is 1.0%, yttrium race rare earth 1.3%, and surplus is Fe.Adopt Tig welding, the Young's modulus of weld seam is 125500Mpa-160 DEG C time, and the heat transfer of weld seam is 0.084JCm-160 DEG C time ^-1s ^-1k ^-1, the thermal coefficient of expansion of weld seam between 0-180 DEG C is 1.3 × 10 ^-6/ DEG C, meet the use needs of invar steel.

Embodiment 2

A kind of invar welding special welding wire, its component and mass fraction are: Ni is 51%, and C content is determined according to the content of Ni, and the mass fraction of C equals 0.145% of Ni, namely 0.074%, Mn is 1.9%, S≤0.0015%, P≤0.011%, Si is 1.0%, yttrium race rare earth 1%, V is 0.14%, and surplus is Fe.Adopt Tig welding, seam organization is single austenite, and the thermal coefficient of expansion of weld seam between 0-180 DEG C is 1.9 × 10-6/ DEG C, meets the use needs of invar steel.

Embodiment 3

A kind of invar welding special welding wire, its component and mass fraction are: Ni is 53.5%, and C content is determined according to the content of Ni, and the mass fraction of C equals 0.145% of Ni, namely 0.077%, Mn is 1.7%, S≤0.0015%, P≤0.011%, Si is 1.4%, yttrium race rare earth 2%, V is 0.13%, and surplus is Fe.Adopt Tig welding, seam organization is single austenite, and the thermal coefficient of expansion of weld seam between 0-180 DEG C is 1.5 × 10 ^-6/ DEG C, meet the use needs of invar steel.

Embodiment 4

A kind of invar welding special welding wire, its component and mass fraction are: Ni is 52%, and C content is determined according to the content of Ni, and the mass fraction of C equals 0.145% of Ni, namely 0.0754%, Mn is 1.75%, S≤0.0015%, P≤0.011%, Si is 1.15%, yttrium race rare earth 1.8%, V is 0.14%, and surplus is Fe.Adopt Tig welding, seam organization is single austenite, and the thermal coefficient of expansion of weld seam between 0-180 DEG C is 1.45 × 10 ^-6/ DEG C, meet the use needs of invar steel.

Claims

1. an invar welding special welding wire, it is characterized in that: its component and mass fraction are: Ni is 51-53.5%, C content is determined according to the content of Ni, and it is 1.7-1.9% that the mass fraction of C equals 0.145%, Mn of Ni, S≤0.0015%, P≤0.011%, Si is 1.0-1.4%, yttrium race rare earth 1-2%, V is 0.13-0.14%, and surplus is Fe.