CN106181115B

CN106181115B - Low spatter 9Ni steel nickel-based welding electrodes

Info

Publication number: CN106181115B
Application number: CN201510211532.4A
Authority: CN
Inventors: 王银柏
Original assignee: Haining Ruiao Metal Technology Co Ltd
Current assignee: Haining Ruiao Metal Technology Co Ltd
Priority date: 2015-04-29
Filing date: 2015-04-29
Publication date: 2018-10-30
Anticipated expiration: 2035-04-29
Also published as: CN106181115A

Abstract

The invention discloses a kind of low spatter 9Ni steel nickel-based welding electrodes, including core wire and surface coating, it is characterised in that core wire ingredient is by weight percentage：C≤0.02%, Si:0.05-0.20%, Mn:0.5-1.9%, Ni:71-80%, Cr:20-30%, Mo:2-5%, S≤0.01%, P≤0.01% and inevitable tramp element；Compositions of surfacing metal includes by weight percentage：6-15% ice crystals, 21-24% marbles, 10-14% rutile, 2-8% silica, 2-7% strontium carbonates, 2-6% metal molybdenums, 2-3% manganese metals, 1-6% boraxs and 0.5-3% seaweed salt and appropriate binder.By three-phase-drying for tobacco, 150-180 DEG C can be prepared by finished product welding rod after one hour in three hours and 170-180 DEG C in one hour, 260-340 DEG C, and arc stability, low spatter, welding bead excellent surface quality adapt to the all-position weldings such as horizontal position welding, vertical position welding.

Description

Low spatter 9Ni steel nickel-based welding electrodes

Technical field

The present invention relates to a kind of nickel-based welding electrode, more particularly to a kind of special nickel-based welding electrodes for the welding of 9Ni steel.

Background technology

9Ni steel is a kind of still steel plate with excellent mechanical property under -196 DEG C of condition of ultralow temperature, therefore is commonly used for Build liquefied natural gas (LNG) storage tank.Currently, the volume of storage tank is in 14-25m³Between, building course be unable to do without welding, and electric Welding rod can adapt to all-position welding, even more material indispensable in building course.As Large-scale Manufacturing is to efficiency requirements Continuous improvement, automatic technology and robot be gradually widely applied, this proposes welding tooling and welding process Higher quality requirement.For example, in the flat section assembly line of shipbuilding industry, the field joint welding of oil and gas pipeline, building Big longitudinal joint vertical position welding of bridge etc. also ensures welding quality using automation gas shield welding connection technology while improving efficiency.

More stringent requirements are proposed to welding bead surface quality, spatter and arc stability for automatic welding technique, no Then it is difficult to ensure weldquality.To improve the quality of automatic welding fitting, welding technology optimization and welding and welding wire matter can be passed through from principle Two aspects such as amount raising, which are started with, solves.It improves the arc stability of welding wire by alloy optimization, reduce spatter Research it is less, industrial majority is still to improve welding technological properties using optimizing welding process.

Prior art (201110068832.3,201110328191.0,201410009476.1 Hes 201410009501.6) 9Ni steel welding rods are provided, but common ground is coating material containing 4% or more fluorite.Fluorite On the one hand liquid metal surface tension can be reduced, slag fluidity is improved and then improves welding bead surface quality；But at high temperature can Pernicious gas hydrogen fluoride is decomposited, the unstable of electric arc is caused, therefore spatter can be increased, influence welding bead Forming Quality.City It is needed on field without fluorite, low spatter and the excellent new type of electrode of welding arc stablility for efficient welding processing.

Invention content

In view of the deficiencies of the prior art, the purpose of the present invention is to provide a kind of novel slag system coating recipes without fluorite Welding rod, its welding arc stablility is good, low spatter.

For achieving the above object, present invention employs following technical solutions：

A kind of nickel-based welding electrode for the welding of 9Ni steel, including core wire and surface coating, it is characterised in that core wire ingredient with Weight percent is calculated as：C≤0.02%, Si:0.05-0.20%, Mn:0.5-1.9%, Ni:71-72%, Cr:24.5%, Mo: 2-5%, S≤0.01%, P≤0.01% and inevitable tramp element；Compositions of surfacing metal includes by weight percentage：6- 15% ice crystal, 21-24% marbles, 10-14% rutile, 2-8% silica, 2-7% strontium carbonates, 2-6% metal molybdenums, 2- 3% manganese metal, 1-6% boraxs and 0.5-3% seaweed salt, surplus are binder.

The composition design of welding rod core wire is illustrated below：

C：Exist as impurity element, content≤0.02%；

Si：It is mainly used for the transition into weld metal, on the one hand the Si in weld metal serves as the deoxidation in weld metal On the other hand element is the intensified element in weld metal.For the needs of welding arc control, addition part is needed to contain in coating There are the oxide or silicate of Si.Consider, the preferred content of the Si in core wire is 0.05-0.20%.

Mn：It is mainly used for the transition into weld metal, on the one hand the Mn in weld metal serves as the deoxidation in weld metal On the other hand element is the intensified element in weld metal.In addition it is also possible to be added to transition by coating.In core wire material Mn contents are more than 1.90%, and the segregation of core wire material on the one hand can be made to increase, its rolling and drawing on the other hand can be made difficult Degree increases, intensity increases, and moulding variation；Can cause in this way core wire in process be easy brittle failure, influence manufacture efficiency and Product qualified rate.Therefore, Mn preferred contents are 0.5-1.90%.

Ni：It is most important element in core wire and welding rod.In view of coating material physical characters of arc and welding process The transfer coefficient of middle alloying element, preferred content are 71-72%.

Cr：It is the important element in weld metal.In view of being closed in coating material physical characters of arc and welding process The transfer coefficient and Ni contents of gold element, preferred content is 24.5%.

Mo:It is most important intensified element in weld metal, considers coating material physical characters of arc and welding process The transfer coefficient of middle alloying element, preferred content are 2-5%.

S：As impurity element, content≤0.01%.

P：As impurity element, content≤0.01%.

It is as follows to compositions of surfacing metal specification：

Ice crystal：Main function is to improve welding bead surface quality, and mechanism is by adjusting the viscosity of slag in welding pool With structure, form the welding slag being easily removed.When its content be below or above preferred content, all can form bonding on welding bead surface Closely, the full of stains or spots slag blanket refuted, influences welding quality.Test result shows that its preferred content is 6-15%,

Marble：On the one hand protection is provided to molten bath using the CO2 decomposed under its condition of high temperature, on the one hand utilizes its generation CaO carry out slag making, clean welds metal, improve removability of slag energy.Consider, preferred content is 21-24%.

Rutile：It is mainly used for welding pool slag making, improves removability of slag energy.On the other hand the Ti members of weld metal are transitioned into Element can also improve welding arc stablility, reduce spatter, so as to improve welding technological properties.In view of marble and The content of silica, preferred content are 10-14%.

Silica：Main function is molten bath slag making, improves removability of slag energy.Its own with marble and the content of rutile and Ratio determines slag blanket structure and physical property, i.e. removability of slag energy.Therefore, preferred content is 2-8%.

Strontium carbonate：Its effect is similar with marble, but is provided simultaneously with two advantages：First, its anti-moisture absorption capacity is better than Dali Stone second is that its high-temperature decomposition temperature is higher than marble, therefore can provide welding pool preferably protection, in compound addition feelings Under condition, preferred content is 2-7%.

Metal molybdenum：It acts on to weld metal transition, improves weld metal intensity, and mechanism is similar with core wire material.One The reason of part is added by coating is can to reduce core wire material rolling drawing difficulty, improve lumber recovery；It is also beneficial to change simultaneously Kind welding rod coating quality, improves welding quality and stability.Therefore, preferred content is 2-6%.

Manganese metal：It acts on to weld metal transition, improves weld metal intensity, and mechanism is similar with core wire material, Preferred content is 2-3%.

Borax：Improve the extrusion performance of coating as lubricant addition, preferred content is 1-6%.When its content mistake When low, effect unobvious；When current too high levels, the spinels field trash introduced can change the slag blanket knot of welding pool Structure and then deterioration removability of slag energy.

Seaweed salt：When being added jointly with borax, be conducive to the uniformity and mobility that improve coating, to further increase Extrusion performance, preferred content are 0.5-3%

Binder：Mobility and viscosity of the appropriate bonding agent for improving coating is added, to be conducive to extrusion performance improvement.

Above-mentioned coating configures, extrusion and it is dry after the completion of, by three-phase-drying for tobacco, 150-180 DEG C one hour, 260- 340 DEG C three hours and 170-180 DEG C one hour, that is, welding rod of the present invention is made.

Compared with prior art, the technology of the present invention advantageous effect at least that：

1, a kind of 9Ni steel nickel-based welding electrodes of the novel slag system without fluorite are provided, welding arc stablility, welding fly It splashes less, welding bead surface quality height, is suitable for efficient welding and processes；

2, it can be used for the high welding operating mode of all-position welding, especially multilayer multiple tracks, surface quality requirements, this mainly benefits In low spatter, welding bead surface quality is high, the removability of slag is good the advantages that.On the one hand the requirement of high face of weld quality is met, simultaneously It also eliminates the aided processes such as polishing and improves welding efficiency.

Description of the drawings

Fig. 1 is experimental design arrangement figure of the present invention

Fig. 2 is the embodiment of the present invention and comparative example core wire chemical composition comparison diagram

Fig. 3 is the embodiment of the present invention and comparative example compositions of surfacing metal figure

Fig. 4 is welding procedure test result figure of the present invention

Fig. 5 is deposited metal mechanical property figure of the present invention

Specific implementation mode

It elaborates below to the embodiment of the present invention.

The present invention provides a kind of nickel-based welding electrodes for the welding of 9Ni steel, including core wire and surface coating, feature to exist It is by weight percentage in core wire ingredient：C≤0.02%, Si:0.05-0.20%, Mn:0.5-1.9%, Ni:71-72%, Cr:24.5%, Mo:2-5%, S≤0.01%, P≤0.01% and inevitable tramp element；Compositions of surfacing metal is with weight hundred Divide and includes than meter：6-15% ice crystals, 21-24% marbles, 10-14% rutile, 2-8% silica, 2-7% strontium carbonates, 2-6% metal molybdenums, 2-3% manganese metals, 1-6% boraxs and 0.5-3% seaweed salt, surplus are binder.

Each ingredient powder is proportionally uniformly mixed, is then fed into be wrapped in extrusion press and be appreciated in core wire, through overdrying Dry, three-phase-drying for tobacco, 150-180 DEG C one hour, 260-340 DEG C three hours and 170-180 DEG C one hour, that is, institute of the present invention is made State welding rod.

4 kinds of welding rods are selected for embodiment, 4 kinds of welding rods is especially tailored for comparative example, then carries out soldering test, and survey Try processing performance and mechanical property.

Soldering test details is shown in that Fig. 1, welding rod core wire and compositions of surfacing metal are shown in that Fig. 2 and 3, welding procedure test result are shown in Fig. 4, weldering It connects deposited metal mechanical property and sees Fig. 5.

From the above results, the present invention is redesigned by core wire and compositions of surfacing metal, has obtained welding arc stablility Good, low spatter, easily de- slag, the good welding rod of weld bead shape, and horizontal position welding and the capability of welding vertically upwards can be excellent, are suitable for all position welding It connects.

Welding rod of the present invention is not restricted to the described embodiments, any improvement met in scope of the presently claimed invention With variation all within protection domain of the presently claimed invention.

Claims

1. a kind of low spatter 9Ni steel nickel-based welding electrodes, including core wire and surface coating, it is characterised in that core wire ingredient is with weight Percentages are：C≤0.02%, Si:0.05-0.20%, Mn:0.5-1.9%, Ni:71-72%, Cr:24.5%, Mo:2- 5%, S≤0.01%, P≤0.01% and inevitable tramp element；Compositions of surfacing metal includes by weight percentage：6- 15% ice crystal, 21-24% marbles, 10-14% rutile, 2-8% silica, 2-7% strontium carbonates, 2-6% metal molybdenums, 2- 3% manganese metal, 1-6% boraxs and 0.5-3% seaweed salt, surplus are binder.