CN109986176A - The semi-automatic vertical position welding technique of the flux-cored wire gas shielded of 9%Ni steel plate - Google Patents
The semi-automatic vertical position welding technique of the flux-cored wire gas shielded of 9%Ni steel plate Download PDFInfo
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- CN109986176A CN109986176A CN201910205435.2A CN201910205435A CN109986176A CN 109986176 A CN109986176 A CN 109986176A CN 201910205435 A CN201910205435 A CN 201910205435A CN 109986176 A CN109986176 A CN 109986176A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/38—Selection of media, e.g. special atmospheres for surrounding the working area
- B23K35/383—Selection of media, e.g. special atmospheres for surrounding the working area mainly containing noble gases or nitrogen
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
Abstract
The present invention relates to steel plate vertical position welding technology fields; it is a kind of semi-automatic vertical position welding technique of flux-cored wire gas shielded of 9%Ni steel plate; welding including carrying out cross joint to 9%Ni steel plate operates; welding operation specifically: welding wire uses flux cored, gas shielded welding wire; protective gas is mixed gas, and welding uses semi-automatic upward welding in the vertical position technique.The present invention is by selecting the flux-cored wire to match with 9%Ni steel plate, it is additional mixed gas protected, realize the siding cross joint semi-automatic welding of LNG storage tank inner canister low temperature Steel material 9%Ni steel, it is by integrally using semi-automatic welding to weld seam, traditional manual welding can be broken through, process, which will be intermittently welded, becomes continuous welding process, reduce welding point, improve welding quality and working efficiency, reduce operating cost, improve the degree of automation of 9%Ni steel steel plate vertical position welding seam welding, it can reduce the influence of human factor and the requirement to welder's level of skill by semi-automatic welding, mitigate the labor intensity of welding.
Description
Technical field
It is that a kind of flux-cored wire gas shielded of 9%Ni steel plate is semi-automatic vertical the present invention relates to steel plate vertical position welding technology field
Welding.
Background technique
The semi-automatic welding of plate vertical position of welding refers to that in the case where steel plate is relatively fixed, welding wire is sent automatically by wire-feed motor
Out, welding gun is driven to move along weld seam by hand, to realize semi-automatic welding.
Liquefied natural gas (LNG) is high-quality as one kind, cleans, is efficient, convenient novel green clean energy resource, exists in recent years
Countries in the world all obtain wide model and promote and apply, and have thus driven the fast development of LNG industry.
Low-temperature storage tank is the key equipment in LNG project, is generally made of outer tank, Cold-keeping Layer and inner canister.Wherein, 9%Ni steel
- 165 DEG C of low temperature environment is served in material as LNG storage tank inner canister, welding technique is LNG low-temperature storage tank construction core
One of heart technology.
Currently, the low-temperature steel plate 9%Ni steel plate of China's independent research has application to 160,000 m of Shandong LNG project3Low-temperature storage tank,
2 160,000 m of Jiangsu LNG receiving station engineering3In the LNG low-temperature storage tank engineering such as low-temperature storage tank, but match with tank shell in it
Special welding material (welding rod, welding wire, solder flux) all relies on import.For the cross joint of LNG storage tank, welding electrode arc welding is still
China is built at present, welding method that tank shell cross joint generallys use in several LNG low-temperature storage tanks built, welding electrode arc welding
Have many advantages, such as that equipment is simple, have a wide range of application, deficiency is that the degree of automation is low, and welding difficulty is big, due to by human factor
Be affected, welder's level of skill is required high, large labor intensity, heat input controllability is poor, eventually leads to welding quality
Low, welding efficiency is low.
In conclusion in LNG storage tank project construction field, demand of the construction enterprises to advanced welding procedure is very urgent.
Summary of the invention
The present invention provides a kind of semi-automatic vertical position welding techniques of the flux-cored wire gas shielded of 9%Ni steel plate, overcome above-mentioned existing
The deficiency of technology, the cross joint that can effectively solve existing 9%Ni steel plate is low using the degree of automation existing for welding electrode arc welding,
Welding difficulty is big, due to being affected by human factor, requires height to welder's level of skill, large labor intensity, heat input can
Control property is poor, eventually leads to that welding quality is low, the low problem of welding efficiency.
The technical scheme is that realized by following measures: a kind of flux-cored wire gas shielded of 9%Ni steel plate half
Automatic vertical position technique, the welding including carrying out cross joint to 9%Ni steel plate operate, welding operation specifically: welding wire uses medicine core gas
Welding wire is protected, protective gas is mixed gas, and welding uses semi-automatic upward welding in the vertical position technique.
Here is the further optimization and/or improvements to invention technology described above scheme:
Above-mentioned that welding pretreatment operation can be carried out before being subjected to 9%Ni steel plate cross joint, welding pretreatment includes slope
Mouth processing, groove cleaning and group pair, the concrete operations of retaining wall on slope are as follows: wall thickness is selected to carry out for the 9%Ni steel steel plate of 20mm to it
Double V-groove processing, the design parameter of double V-groove are as follows: bevel angle is 27 ° to 33 °, and root face is 0 to 0.5mm, and wooden partition thickness is
20mm。
Above-mentioned group can to the design parameter for the 9%Ni steel plate that retaining wall on slope is completed to be grouped, organized pair are as follows: group pair
Gap is 0 to 0.5mm, and group should be no more than 1.5mm to unfitness of butt joint, and should be uniformly distributed along fusion length direction.
The welding operation of above-mentioned cross joint may include the welding of root bead layer, the welding of hot weld layer, filled layer welding, the welding of capping layer
With envelope backing weld, welding equipment selects the CH-500 Pro Multifunctional welding of Kunshan peace meaning source capsule road Science and Technology Ltd. production
Machine, 9%Ni steel plate select the 9%Ni steel plate that the trade mark of Nanjing Steel stock Co., Ltd's production is X7Ni9, and welding wire selects Kunshan capital
The flux cored, gas shielded weldering of the model ENiCrMo3T1-4 and trade mark AFN-CM3/ Φ 1.2mm of the production of group wlding Science and Technology Ltd.
Silk, each layer of welding are all made of semi-automatic upward welding in the vertical position technique, and weldingvoltage is 22V to 28V, and the stem elongation degree of welding wire is
12mm to 18mm, groove both ends residence time are 0 to 6ms, and the amplitude of oscillation is subject to weld metal deposition to welding bead edge, and sweating heat is defeated
Enter for 12KJ/cm to 18KJ/cm.
The welding current of above-mentioned root bead layer welding can be 140A to 170A, and speed of welding is 12cm/min to 22cm/min.
The welding current of above-mentioned hot weld layer welding and filled layer welding can be 150A to 180A, speed of welding 13cm/min
To 24cm/min.
The welding current of above-mentioned capping layer welding and envelope backing weld can be 155A to 190A, speed of welding 13cm/min
To 24cm/min.
It is above-mentioned first to be removed the root reinforcement of root run using mechanical means before sealing backing weld, and reconditioning is to U
Type groove.
It can be preheated without groove before above-mentioned welding.
It is above-mentioned that groove can be preheated to 50 DEG C using induction heating or electrically heated method, width is preheated to be not less than groove
It is advisable within the scope of each 50mm in two sides, and guarantees that preheating temperature is uniform, interlayer temperature should be no more than 90 DEG C.
Above-mentioned mixed gases matching can be made of 75% argon gas and 25% carbon dioxide gas, the gas purity point of mixed gas
Not are as follows: argon gas >=99.995%, carbon dioxide gas >=99.95%, output flow 18 L/min to 25L/min of mixed gas.
This present invention is additional mixed gas protected by selecting the flux-cored wire to match with 9%Ni steel plate, realizes LNG
The siding cross joint semi-automatic welding of storage tank inner canister low temperature Steel material 9%Ni steel, by integrally using semiautomatic welding to weld seam
It connects, traditional manual welding can be broken through, the process of being intermittently welded is become into continuous welding process, reduces welding point, improve
Welding quality and working efficiency, reduce operating cost, improve the degree of automation of 9%Ni steel steel plate vertical position welding seam welding,
The influence of human factor and requirement to welder's level of skill can be reduced by semi-automatic welding, mitigates the labor intensity of welding,
Enhance the controllability of heat input, has welding degree high, welding difficulty is small, and welding quality is good, the high feature of welding efficiency；It is logical
The welding to each layer is crossed using identical welding equipment, welding wire and welding procedure, 9%Ni steel plate vertical position welding can be able to achieve convenient for welder
The continuous welding of seam reduces welding point, and having weld seam, interlayer weld seam filling metal is smooth, each layer weld edge fusion is good
The characteristics of, and because a whole set of welding procedure all uses semiautomatic welding to weld, it ensure that the reliable and stable of welding quality；And the present invention
The whole production domesticization for realizing 9%Ni steel plate, welding machine, welding wire, change the status that current welding material relies on import, to drop
The low cost of 9%Ni steel plate cross joint semi-automatic welding.
Detailed description of the invention
Attached drawing 1 is schematic diagram of main cross-sectional structure that light plate of the present invention is double V-groove.
Attached drawing 2 is the schematic diagram of main cross-sectional structure of light plate group of the present invention to the double V-groove of formation.
Attached drawing 3 is schematic diagram of main cross-sectional structure that the weld seam that the present invention welds welds the number of plies.
Coding in attached drawing is respectively as follows: 1 for root bead layer, and 2 be hot weld layer, and 3 be filled layer, and 4 be capping layer, and 5 be back cover layer,
ɑ is bevel angle, and δ is wall thickness, and p is root face, and b is group to gap, and h is face of weld reinforcement, and W is cap weld width.
Specific embodiment
The present invention is not limited by the following examples, can determine according to the technique and scheme of the present invention with actual conditions specific
Embodiment.
In the present invention, for ease of description, the description of the relative positional relationship of each component is according to Figure of description 1
Butut mode be described, such as: front, rear, top, and bottom, left and right positional relationship be the Butut according to Figure of description
Direction determines.
Below with reference to examples and drawings, the invention will be further described:
As shown in attached drawing 1,2,3, the semi-automatic vertical position welding technique of the flux-cored wire gas shielded of the 9%Ni steel plate include to 9%Ni steel plate into
The welding of row cross joint operates, welding operation specifically: and welding wire uses flux cored, gas shielded welding wire, and protective gas is mixed gas,
Welding uses semi-automatic upward welding in the vertical position technique.The present invention is by selecting the flux-cored wire to match with 9%Ni steel plate, additional mixing
Gas shield realizes the tank shell cross joint semi-automatic welding of LNG storage tank inner canister low temperature Steel material 9%Ni steel, by pair
Weld seam integrally uses semi-automatic welding, can break through traditional manual welding, and the process of being intermittently welded is become continuous welding process,
Reduce welding point, improve welding quality and working efficiency, reduce operating cost, improves 9%Ni steel steel plate cross joint
The degree of automation of welding can reduce the influence of human factor and the requirement to welder's level of skill by semi-automatic welding,
The labor intensity for mitigating welding, enhances the controllability of heat input, has Automation of Welding degree high, and welding difficulty is small, welds matter
It measures, the high feature of welding efficiency.
The semi-automatic vertical position welding technique of the flux-cored wire gas shielded of above-mentioned 9%Ni steel plate can be made further excellent according to actual needs
Change or/and improve:
As shown in Fig. 1, welding pretreatment operation, welding pretreatment are carried out before being subjected to 9%Ni steel plate cross joint
Including retaining wall on slope, groove cleaning and group pair, the concrete operations of retaining wall on slope are as follows: selecting wall thickness δ is the 9%Ni steel steel plate of 20mm
Double V-groove processing, the design parameter of double V-groove are carried out to it are as follows: bevel angle ɑ is 27 ° to 33 °, and root face p is 0 to 0.5mm,
Wooden partition thickness δ is 20mm.Due in the welding process, welding gun walking, swing, wire feed, shield gas flow rate by manual adjustment, with
Swing parameter and incrementally increase, speed of welding will gradually reduce inevitably, interior so groove width must limit
The plate end face groove of tank shell cross joint is the outer root bead groove padded without the back side, and finished edge end face must smooth, table
Face is smooth, does not play unicorn, and root face p is uniform, and welding quality thus can be improved.According to demand, the plate groove of processing should be without liner
The outer root bead groove of pad.
As shown in Fig. 2, group is to the design parameter for the 9%Ni steel plate that retaining wall on slope is completed to be grouped, organized pair
Are as follows: group is 0 to 0.5mm to gap b, and group should be no more than 1.5mm to unfitness of butt joint, and should be uniformly distributed along fusion length direction.?
Group should first carry out groove cleaning to preceding, by carrying out visual examination to surface of steel plate, plate end face surface to be welded should uniformly,
It is smooth, should not there are delamination, abrasion, iron rust, slag dirt, grease, paint and the other materials for influencing welding quality；Machinery side should be used
Cleaning within the scope of each 30mm in groove two sides is advisable by method to metallic luster is presented；Group to operation when, can be used positioning fixture into
Row group pair, fixture should not leave indentation, polishing scratch and greasy dirt in surface of steel plate；Group clock synchronization should not tap the both ends of steel plate, must not be strong
Power group pair；Groove is the outer root bead groove padded without the back side；Thus it can further improve welding quality of the invention.
As shown in Fig. 3, the welding operation of cross joint is welded including the welding of root bead layer 1, hot weld layer 2, filled layer 3 welds,
The welding of capping layer 4 and back cover layer 5 weld, and welding equipment selects the CH-500 of Kunshan peace meaning source capsule road Science and Technology Ltd. production
Pro multifunctional welding machine, 9%Ni steel plate select the 9%Ni steel plate that the trade mark of Nanjing Steel stock Co., Ltd's production is X7Ni9, weldering
Silk selects the medicine of the model ENiCrMo3T1-4 and trade mark AFN-CM3/ Φ 1.2mm of Kunshan Gintune Welding Co., Ltd.'s production
Core gas protection wire, each layer of welding are all made of semi-automatic upward welding in the vertical position technique, and weldingvoltage is 22V to 28V, and welding wire is done
Elongation is 12mm to 18mm, and the groove both ends residence time is 0 to 6ms, and the amplitude of oscillation is subject to weld metal deposition to welding bead edge,
Thermal weld stress is 12KJ/cm to 18KJ/cm.According to demand, root bead layer 1, hot weld layer 2, filled layer 3, capping layer 4 and back cover layer
5 distribution should be consistent with conventionally known each layer distribution, is specially successively placed with root outward from the groove root of double V-groove
Layer 1, hot weld layer 2, filled layer 3 and capping layer 4, the back cover layer 5 opposite with root bead layer 1 is distributed in the back side at root weld.
The present invention uses identical welding equipment, welding wire and layer welding procedure by the welding to each layer, can be able to achieve 9% convenient for welder
The continuous welding of Ni steel plate cross joint reduces welding point, and having weld seam, interlayer weld seam filling metal is smooth, each layer joint edge
Edge fuses good feature, and because a whole set of welding procedure all uses semiautomatic welding to weld, ensure that the stabilization of welding quality can
It leans on；And the present invention realizes whole production domesticization of 9%Ni steel plate, welding equipment, welding wire, change current welding material rely on into
The status of mouth, to reduce the cost of 9%Ni steel plate cross joint semi-automatic welding.According to demand, the number of plies of filled layer 3 can be
Multilayer need to specifically consider the thickness, welding wire and layer Welding of steel plate to be welded；The 9%Ni steel plate certain for thickness, the present invention
By using the semi-automatic upward welding in the vertical position technique of medicine core torch welding rods fabricated gas shielded, filled out compared with that can be effectively reduced for other existing welding procedures
The welding number of plies of layer 3 is filled, so that welding quality of the invention can be improved.
As shown in Fig. 3, root bead layer 1 weld welding current be 140A to 170A, speed of welding be 12cm/min extremely
22cm/min.Thus it can be made to meet the operation of the welding of root bead layer 1.
As shown in Fig. 3, the welding current that the welding of hot weld layer 2 and filled layer 3 weld is 150A to 180A, and speed of welding is
13cm/min to 24cm/min.Thus it can make the operation that it meets the welding of hot weld layer 2 and filled layer 3 welds.
As shown in Fig. 3, the welding current that the welding of capping layer 4 and back cover layer 5 weld is 155A to 190A, and speed of welding is
13cm/min to 24cm/min.Thus it can make the operation that it meets the welding of capping layer 4 and back cover layer 5 welds.
As shown in Fig. 3, first the root reinforcement of root run is removed using mechanical means before back cover layer 5 welds, and
Reconditioning is to U-shaped groove.Thus Shi Nengyu root bead layer 1 can be welded convenient for back cover layer 5 well to merge, and can make interlayer weld seam filling gold
Belong to smooth.
As a preference, being preheated before welding without groove.Thus it can meet welding demand.
As another preferred embodiment, groove is preheated to 50 DEG C using induction heating or electrically heated method, preheat width with
It is advisable within the scope of 50mm each not less than groove two sides, and guarantees that preheating temperature is uniform, interlayer temperature should be no more than 90 DEG C.Thus may be used
Meet welding demand.
According to demand, mixed gases matching is made of 75% argon gas and 25% carbon dioxide gas, the gas purity of mixed gas
It is respectively as follows: argon gas >=99.995%, carbon dioxide gas >=99.95%, output flow 18 L/min to 25L/min of mixed gas.
Thus it can meet welding demand.In the present invention: the percentage of gas is all percent by volume.
The present embodiment is the carry out vertical position welding of the 9%Ni steel plate of X7Ni9 with the trade mark that produces to Nanjing Steel stock Co., Ltd
For seam welding operation, welding step is as follows:
One, pretreatment operation is welded
1, retaining wall on slope.Steel plate material is the 9%Ni steel of X7Ni9, and wall thickness δ is 20mm, selects double V-groove, bevel angle ɑ is
27.5 °~32.5 °, root face p is 0~0.5mm.All plate hipped end mouths must be processed using mechanical means, and finished edge end
It face must be smooth, uniform, smooth；
In the welding process, welding gun walking, swing, wire feed, shield gas flow rate be by manual adjustment, with swing parameter by
Step increases, and speed of welding will be gradually reduced inevitably, so groove width must limit, interior tank shell cross joint
Plate end face groove is the outer root bead groove padded without the back side, and finished edge end face must be smooth, and surface is smooth, does not play unicorn,
Root face p is uniform；
2, groove is cleared up.Before being grouped, should to surface of steel plate carry out visual examination, plate end face surface to be welded should uniformly,
It is smooth, should not there are delamination, abrasion, iron rust, slag dirt, grease, paint and the other materials for influencing welding quality；Machinery side should be used
Cleaning within the scope of each 30mm in groove two sides is advisable by method to metallic luster is presented；
3, group pair.It is grouped using positioning fixture.When operation, fixture should not leave indentation, polishing scratch and greasy dirt in surface of steel plate.
Group clock synchronization should not tap the both ends of steel plate, must not strongly organize pair.Groove is the outer root bead groove padded without the back side, and group is to gap
B is 0~0.5mm, and group answers≤1.5mm to unfitness of butt joint, and should be uniformly distributed along fusion length direction.
Two, the welding operation of cross joint
1, it is checked before weldering
Welding equipment and utensil: 1. welding equipment selects the CH-500 Pro of Kunshan peace meaning source capsule road Science and Technology Ltd. production more
Whether in place function welding machine checks each rotary switches such as equipment, indicating meter, switch, electric power polarity, and whether route connects, defeated
Whether gas-tpe fitting tightens, and whether welding gun connector loosens, and whether ignition tip is tightened；2. gas cylinder: checking gas cylinder, Ar table, CO2Table
And air inlet pipe, it checks storage pressure, checks connection, guarantee that gas circuit is unimpeded and gas pressure is stablized；3. commissioning device, it is ensured that
Welding circuit is normal；4. checking wire-feed motor, it is ensured that wire feed system is unobstructed；
Welding material: 1. welding wire selects the model ENiCrMo3T1-4 of Kunshan Gintune Welding Co., Ltd.'s production, the trade mark
The flux cored, gas shielded welding wire of AFN-CM3/ Φ 1.2mm；2. protective gas uses 75%Ar+25% CO2Mixed gas, purity: argon gas
>=99.995%, carbon dioxide gas >=99.95%, gas flow 18L/min~25L/min；
2, welding operation
Before welding, groove group should be checked to size, it is ensured that group meets welding procedure specification (WPS) requirement to quality.It is not preheated before welding,
Or groove is preheated to 50 DEG C using induction heating or electrically heated method, width is preheated to be not less than each 50mm model in groove two sides
It is advisable in enclosing, and guarantees that preheating temperature is uniform；Interlayer temperature should be 90 DEG C of <.
Root bead layer 1 welds, and welding condition selection is as follows: welding equipment selects the limited public affairs of Kunshan peace meaning source capsule road science and technology
Take charge of the CH-500 Pro multifunctional welding machine of production, the model that welding wire selects Kunshan Gintune Welding Co., Ltd. to produce
ENiCrMo3T1-4, the flux cored, gas shielded welding wire of trade mark AFN-CM3/ Φ 1.2mm, using semi-automatic upward welding in the vertical position technique, welding electricity
Flow 140A~170A, weldingvoltage 22V~28V, speed of welding 12cm/min~22cm/min, the stem elongation degree 12mm of welding wire~
18mm, thermal weld stress 12KJ/cm~18KJ/cm, groove both ends residence time are 0ms~6ms, and the amplitude of oscillation is with weld metal deposition
To subject to welding bead edge, protective gas uses 75%Ar+25%CO2Mixed gas, gas flow 18L/min~25L/min.
The welding of hot weld layer 2, filled layer 3 weld, and welding condition selection is as follows: welding equipment selects Kunshan peace meaning source capsule
The CH-500 Pro multifunctional welding machine of road Science and Technology Ltd. production, welding wire select Kunshan Gintune Welding Co., Ltd. to produce
Model ENiCrMo3T1-4, the flux cored, gas shielded welding wire of trade mark AFN-CM3/ Φ 1.2mm, using semi-automatic upward welding in the vertical position technique,
Welding current 150A~180A, weldingvoltage 22V~28V, speed of welding 13cm/min~24cm/min, the stem elongation degree of welding wire
12mm~18mm, thermal weld stress 12KJ/cm~18KJ/cm, groove both ends residence time are 0ms~6ms, and the amplitude of oscillation is with weld seam gold
Belong to subject to deposition to welding bead edge, protective gas uses 75%Ar+25%CO2Mixed gas, gas flow 18L/min~25L/
min.Wherein, the number of plies of filled layer 3 is that two layers (for the 9%Ni steel plate that the material of same thickness is X7Ni9, use is existing
Up to four to five layers of the number of plies of the filled layer 3 of well-known technique).
The welding of capping layer 4, back cover layer 5 weld, and welding condition selection is as follows: welding equipment selects Kunshan peace meaning source capsule
The CH-500 Pro multifunctional welding machine of road Science and Technology Ltd. production, welding material select Kunshan Gintune Welding Co., Ltd.
Model ENiCrMo3T1-4, the flux cored, gas shielded welding wire of trade mark AFN-CM3/ Φ 1.2mm of production, using semi-automatic upward welding in the vertical position work
Skill, welding current 155A~190A, weldingvoltage 22V~28V, speed of welding 13cm/min~24cm/min, the dry of welding wire are stretched
Length 12mm~18mm, thermal weld stress 12KJ/cm~18KJ/cm, groove both ends residence time are 0ms~6ms, and the amplitude of oscillation is to weld
It stitches subject to metal deposition to welding bead edge, protective gas uses 75%Ar+25%CO2Mixed gas, gas flow be 18L/min~
25L/min。
In the present invention: the percentage of gas is all percent by volume.
Above-described embodiment welding condition and other parameters see attached list 1.
Above-mentioned banjo fixing butt jointing is welded using the method for the present invention and affiliated welding condition, according to standard NB/
T47014-2011 " bearing device qualification of welding procedure " and GB/T 19869.1-2005/ISO 15614-1:2004 " steel, nickel
And the welding procedure qualification test of nickel alloy " require, the inspection project of banjo fixing butt jointing are as follows: visual examination, RT detection and mechanical property
It can test.
Inspection result shows: weld appearance forming uniformity, not cracked, unmelted on weld seam and its neighbouring surface
The defects of conjunction, stomata, slag inclusion, recess；The side more every than outer surface groove width cap weld width W increases 0.5mm~2.0mm, wrong
Side amount≤1.5mm, face of weld reinforcement h is between 0mm~2mm, and undercut depth is between 0.2mm~0.5mm；Visual examination is closed
After lattice, RT detection is carried out, the requirement of NB/T 47013.2-2015 " bearing device non-destructive testing " ray standard is met；RT detection
After qualification, then mechanical property test is carried out, it is tension test, bend test, -196 DEG C of low-temperature impact tests, macroscopical metallographic, hard
Degree test etc. meets NB/T47014-2011 " bearing device qualification of welding procedure " and GB/T 19869.1-2005/ISO
The requirement of 15614-1:2004 " welding procedure qualification test of steel, nickel and nickel alloy " standard.
LNG tank inner canister low-temperature steel is carried out using the semi-automatic up hill welding of flux-cored wire gas shielded of the invention
The welding procedure of the 9%Ni steel plate vertical position welding seam welding of material, can be widely applied to the interior tank shell vertical position welding of LNG storage tank construction project
The weld job of seam, technical advantage include:
1, since a whole set of welding procedure all uses semi-automatic welding, traditional manual welding is broken through, process change will be intermittently welded
For continuous welding process, welding point is reduced, welding quality is improved, improves the automation journey of 9%Ni steel plate vertical position welding seam welding
It spends, under same operating condition, than the weld interval that manual welding technique can reduce 1/3, improves welding efficiency, reduce work
Industry cost；
2, with interlayer weld seam filling metal, smooth, each layer weld edge fuses well the weld seam welded using the present invention, and because
A whole set of welding procedure all uses semiautomatic welding to weld, and ensure that the reliable and stable of welding quality；
3, the present invention solves the 9%Ni steel for restricting tank shell low temperature Steel material in liquefied natural gas (LNG) storage tank construction project
Plate cross joint welding efficiency is low, welding material relies on the status of import, realizes the semi-automatic welding using domestic welding material.
The above technical characteristic constitutes highly preferred embodiment of the present invention, with stronger adaptability and best implementation effect
Fruit can increase and decrease non-essential technical characteristic, according to actual needs to meet the needs of different situations.
Claims (10)
1. a kind of semi-automatic vertical position welding technique of the flux-cored wire gas shielded of 9%Ni steel plate, it is characterised in that including being carried out to 9%Ni steel plate
The welding of cross joint operates, welding operation specifically: welding wire uses flux cored, gas shielded welding wire, and protective gas is mixed gas, weldering
It connects using semi-automatic upward welding in the vertical position technique.
2. the semi-automatic vertical position welding technique of the flux-cored wire gas shielded of 9%Ni steel plate according to claim 1, it is characterised in that
Welding pretreatment operation is carried out before being subjected to 9%Ni steel plate cross joint, welding pretreatment includes retaining wall on slope, groove
Cleaning and group pair, the concrete operations of retaining wall on slope are as follows: select wall thickness to carry out double V-groove to it for the 9%Ni steel steel plate of 20mm and add
Work, the design parameter of double V-groove are as follows: bevel angle is 27 ° to 33 °, and root face is 0 to 0.5mm, and wooden partition thickness is 20mm.
3. the semi-automatic vertical position welding technique of the flux-cored wire gas shielded of 9%Ni steel plate according to claim 2, it is characterised in that group
To the design parameter for the 9%Ni steel plate that retaining wall on slope is completed to be grouped, organized pair are as follows: group is 0 to 0.5mm to gap, group
1.5mm should be no more than to unfitness of butt joint, and should be uniformly distributed along fusion length direction.
4. the semi-automatic vertical position welding technique of the flux-cored wire gas shielded of 9%Ni steel plate according to claim 1 or 2 or 3, feature
The welding operation for being cross joint includes the welding of root bead layer, the welding of hot weld layer, filled layer welding, the welding of capping layer and the weldering of back cover layer
It connects, welding equipment selects the CH-500 Pro multifunctional welding machine of Kunshan peace meaning source capsule road Science and Technology Ltd. production, 9%Ni steel plate
The 9%Ni steel plate that the trade mark of Nanjing Steel stock Co., Ltd's production is X7Ni9 is selected, welding wire selects Kunshan capital group's wlding science and technology
The flux cored, gas shielded welding wire of the model ENiCrMo3T1-4 and trade mark AFN-CM3/ Φ 1.2mm of Co., Ltd's production, each layer of weldering
It connects and is all made of semi-automatic upward welding in the vertical position technique, weldingvoltage is 22V to 28V, and the stem elongation degree of welding wire is 12mm to 18mm, slope
Mouthful both ends residence time is 0 to 6ms, and the amplitude of oscillation is subject to weld metal deposition to welding bead edge, thermal weld stress for 12KJ/cm extremely
18KJ/cm。
5. the semi-automatic vertical position welding technique of the flux-cored wire gas shielded of 9%Ni steel plate according to claim 4, it is characterised in that root
The welding current of layer welding is 140A to 170A, and speed of welding is 12cm/min to 22cm/min；Or/and hot weld layer welding
Welding current with filled layer welding is 150A to 180A, and speed of welding is 13cm/min to 24cm/min；Or/and capping layer
The welding current of welding and envelope backing weld is 155A to 190A, and speed of welding is 13cm/min to 24cm/min.
6. the semi-automatic vertical position welding technique of the flux-cored wire gas shielded of 9%Ni steel plate according to claim 4, it is characterised in that
It seals before backing weld and is first removed the root reinforcement of root run using mechanical means, and reconditioning is to U-shaped groove.
7. the semi-automatic vertical position welding technique of the flux-cored wire gas shielded of 9%Ni steel plate according to claim 5, it is characterised in that
It seals before backing weld and is first removed the root reinforcement of root run using mechanical means, and reconditioning is to U-shaped groove.
8. according to the semi-automatic vertical position welding technique of the flux-cored wire gas shielded of 9%Ni steel plate described in claim 5 or 6 or 7, feature
It is to preheat before welding without groove；Or, groove is preheated to 50 DEG C using induction heating or electrically heated method, preheating is wide
Degree is advisable with being not less than within the scope of each 50mm in groove two sides, and guarantees that preheating temperature is uniform, and interlayer temperature should be no more than 90 DEG C.
9. the semi-automatic vertical position welding work of the flux-cored wire gas shielded of 9%Ni steel plate described according to claim 1 or 2 or 3 or 5 or 6 or 7
Skill, it is characterised in that mixed gases matching is made of 75% argon gas and 25% carbon dioxide gas, the gas purity difference of mixed gas
Are as follows: argon gas >=99.995%, carbon dioxide gas >=99.95%, output flow 18 L/min to 25L/min of mixed gas.
10. the semi-automatic vertical position welding technique of the flux-cored wire gas shielded of 9%Ni steel plate according to claim 4, it is characterised in that mixed
Close gas mixing ratio be made of 75% argon gas and 25% carbon dioxide gas, the gas purity of mixed gas be respectively as follows: argon gas >=
99.995%, carbon dioxide gas >=99.95%, output flow 18 L/min to 25L/min of mixed gas.
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