CN106670671B - The welding method of martensite heat-resistant steel lug weldment - Google Patents
The welding method of martensite heat-resistant steel lug weldment Download PDFInfo
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- CN106670671B CN106670671B CN201611059170.2A CN201611059170A CN106670671B CN 106670671 B CN106670671 B CN 106670671B CN 201611059170 A CN201611059170 A CN 201611059170A CN 106670671 B CN106670671 B CN 106670671B
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- lug
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- estrade
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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- Optics & Photonics (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
A kind of welding method of martensite heat-resistant steel lug weldment, including opening up groove, the docking of lug ontology, unilateral docking soldering, back chipping, ultrasound detection, filling soldering, symmetrical soldering step, by the way that bevel shape, unilateral docking soldering, back chipping is rationally arranged in the method for the present invention, the defect of lug root is effectively removed, to effectively improve martensite high alloy lug weldment weldquality, reduce the probability that lug docking root generates defect, lug welding number of rewelding is reduced, so as to shorten the production cycle, reduces and reprocesses cost.
Description
Technical field
The present invention relates to martensite heat-resistant steel welding technology field more particularly to a kind of martensite heat-resistant steel lug weldments
Welding method.
Background technique
Martensite heat-resistant steel is gradually grown up on the basis of 9Cr1Mo.Since martensite steel has good heat strong
Property, mainly for the manufacture of the components for being subjected to high temperature and pressure in generating equipment.Forged molding martensite heat-resistant steel,
Mechanical performance is good compared with the martensite heat-resistant steel of casting and forming.It is commonly used to manufacture the weldments such as pipe fitting and heat preservation lug.
Warm lug is more typical in steam turbine, and main application is after welding on the body, to drill on lug, then
Temperature measuring equipment is installed in the hole of lug, steam turbine internal temperature is monitored.
Since the welding requirements of the generally such lug weldment of its purposes, the particularity of structure is high, groove weld region is not
Allow defective presence.In ASME inspection criterion, the ultrasound examination rank of this base part is level-one, i.e., does not allow diameter super
The spot defect for crossing 1.5mm exists.
Currently, such lug welding technique difficult point major embodiment is both ways: first is that in lug and ontology interface, not melting
It closes defect and spot defect is more typical, and be concentrated mainly on centre.Second is that it is more demanding to welder's operative skill, belong to complete
Position welding.
Based on the above feature, conventional lug welding method soldering success rate is lower, and welding is reprocessed frequently, to the behaviour of welder
It is higher to make skill requirement, welding gimmick control difficulty is larger.
Summary of the invention
It is necessary to propose a kind of martensite heat-resistant steel lug weldment of the defect of the center for removing lug or root
Welding method.
A kind of welding method of martensite heat-resistant steel lug weldment, comprising the following steps:
Open up groove: including opening up lug groove and opening up ontology groove, the lug groove that opens up is the weldering in lug
Connect end and open up K-type groove, the K-type groove end setting width be 2mm~3mm, be highly 3mm~5mm, length with
The equal docking estrade of the diameter length of lug, the docking estrade is arranged along the diametrical direction of lug, described to open up ontology
Groove is to open up K-type groove on the body；
The docking of lug ontology: lug being faced along the end of docking estrade with the end of local K-type groove and is contacted,
So as to form soldering area between the K-type groove of lug and the K-type groove of ontology；
Unilateral side docking soldering: first welding since the soldering area of the side groove of K-type groove, and throat thickness is the docking
8~10 times of the width of estrade, to form unilateral docking area；
Back chipping: by the way of polishing or carbon arc air gouging, the other side groove opposite from unilateral docking area is to docking estrade
It is purged, the thickness of removing is greater than the width or height of docking estrade, will dock estrade and remove completely；
Ultrasound detection: ultrasound detection is carried out to the lug removed after docking estrade, using UT normal probe to lug when detection
End face scan-type sliding, it is whether thorough to detect back chipping；
Filling soldering: being filled soldering to the region removed after docking estrade, to be formed and unilateral docking area pair
Area is filled up in the welding of title, to make the two sides of K-type groove structure having the same；
Symmetrical soldering: two staff are symmetrically welded the two sides of K-type groove, and the soldering area of two sides is welded
Completely.
By the way that bevel shape, unilateral docking soldering, back chipping is rationally arranged in the method for the present invention, effectively removes and taken
The defect of sub- root reduces lug docking root generation and lacks to effectively improve martensite high alloy lug weldment weldquality
Sunken probability reduces lug welding number of rewelding, so as to shorten the production cycle, reduces and reprocesses cost.
Detailed description of the invention
Fig. 1 is that the lug opens up the main view after K-type groove.
Fig. 2 is sectional view of the Fig. 1 along A-A.
Fig. 3 is the width S that docking estrade is identified in Fig. 2, the enlarged drawing of the size of height H, length L.
Fig. 4 is after the lug is docked with ontology and to have welded the structural schematic diagram of unilateral docking area.
Fig. 5 is the partial enlarged view expressed after the docking estrade is docked with ontology and after unilateral docking soldering in Fig. 4.
It can be seen that the plane of the end of docking estrade is faced with the plane of the K-type groove of ontology and contacted in figure.
Fig. 6 is the structural schematic diagram after back chipping.
Fig. 7 is the structural schematic diagram after symmetrical soldering.
In figure: lug 10, docking estrade 11, ontology 20, unilateral docking area 30, clear (area) 40, UT normal probe 50.
Specific embodiment
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be apparent that, drawings in the following description are some embodiments of the invention, common for this field
For technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Referring to Fig. 1 to Fig. 7, the embodiment of the invention provides a kind of welding method of martensite heat-resistant steel lug weldment, packets
Include following steps:
Open up groove: including opening up lug groove and opening up ontology groove, opening up lug groove is the welding in lug 10
End opens up K-type groove, K-type groove end setting width S be 2mm~3mm, height H is 3mm~5mm, length L with take
The equal docking estrade 11 of the diameter length of son 10, docking estrade 11 are arranged along the diametrical direction of lug 10, open up ontology slope
Mouth is to open up K-type groove on ontology 20；The wobble area for opening up welding rod when can increase welding of ontology groove, so that welding
It is handy to operate, also, does not open up groove in contrast to ontology 20, and the welding method of groove is only opened up on lug 10, weldering
Layer and ontology 20 after connecing fuse more preferably, no layer dead angle and crackle.
In an embodiment of the present invention, lug 10 is cylindrical body bar, and the K-type groove opened up is at the end of lug 10
Portion is cut off along the two sides symmetrical slope of cylindrical body bar, and K-type groove is formed after excision.
The docking of lug ontology: lug 10 is faced along the end of docking estrade 11 and the end of local K-type groove
Contact, so as to form soldering area between the K-type groove of lug 10 and the K-type groove of ontology 20；
Unilateral side docking soldering: first welding since the soldering area of the side groove of K-type groove, and throat thickness is docking estrade
8~10 times of 11 width S, to form unilateral docking area 30；
Back chipping: by the way of polishing or carbon arc air gouging, the other side groove opposite from unilateral docking area 30 is to dock
Son 11 is purged, and the thickness of removing is greater than the width S or height H of docking estrade 11, will be docked estrade 11 and be removed completely；By
In unilateral docking area 30 in welding, thermal damage is generated to docking estrade 11, induces and generates defect inside docking estrade 11, so
In order to remove this defect, docking estrade 11 is dug out.
Ultrasound detection: ultrasound detection is carried out to the lug 10 removed after docking estrade 11, UT normal probe 50 is used when detection
End face scan-type sliding to lug 10, it is whether thorough to detect back chipping；
Filling soldering: being filled soldering to the region removed after docking estrade 11, to be formed and unilateral docking area
Area is filled up in 30 symmetrical welding, to make the two sides of K-type groove structure having the same；
Symmetrical soldering: two staff are symmetrically welded the two sides of K-type groove, and a side weld of groove is avoided to receive
Contracting welds the soldering area of two sides complete.
Further, in the step of opening up groove, the opening gradient of the K-type groove on ontology 20 is less than the K-type of lug 10
The opening gradient of groove.So that the width S of the swing space of welding rod is also able to satisfy operational requirements, and compares when welding
Symmetrical structure when the two opening gradient is the same, soldering amount will not be very big, not only solves welding rod, but also also reduce soldering
The probability of the appearance of defect in area.
Further, the opening gradient of the K-type groove of lug 10 is 30 °~60 °, the opening gradient of the K-type groove of ontology 20
It is 10 °~15 °.
Further, the slope surface of one end and K-type groove for docking estrade 11 connects, and the other end of docking estrade 11 is plane,
The end of the K-type groove of ontology 20 is also provided with plane, so that the K-type groove of the plane and ontology 20 of the end of docking estrade 11
Plane faces contact.By plane-plane contact, so that lug 10 to steadily fixed, not will shake left and right.
Further, in back chipping step, when removing docking estrade 11 using polishing or carbon arc air gouging, clear (area) 40 is radius
Arc area greater than the larger value in the width S and height H of docking estrade 11 does not stay in this way, guaranteeing that overlap joint estrade is removed completely
Defect.For example, the width S for docking estrade 11 in a kind of embodiment is 2mm~3mm, height H is 3mm~5mm, then removes at this time
The radius in area 40 is the arc area greater than 5mm.
Further, in ultrasound detection step, the end face of the lug 10 of the surface of clear (area) 40 is repeatedly swept
Formula sliding is retouched, to carry out emphasis detection to clear (area) 40, it is ensured that 40 zero defect of clear (area).
The steps in the embodiment of the present invention can be sequentially adjusted, merged and deleted according to actual needs.
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, those skilled in the art can understand all or part of the processes for realizing the above embodiment, and wants according to right of the present invention
Made equivalent variations is sought, is still belonged to the scope covered by the invention.
Claims (6)
1. a kind of welding method of martensite heat-resistant steel lug weldment, it is characterised in that the following steps are included:
Open up groove: including opening up lug groove and opening up ontology groove, the lug groove that opens up is the welding ends in lug
Head opens up K-type groove, and in the end of the K-type groove, setting width is 2mm~3mm, is highly 3mm~5mm, length and lug
The equal docking estrade of diameter length, the docking estrade is arranged along the diametrical direction of lug, described to open up ontology groove
To open up K-type groove on the body；
The docking of lug ontology: lug being faced along the end of docking estrade with the end of the K-type groove of ontology and is contacted, so that
Soldering area is formed between the K-type groove of lug and the K-type groove of ontology；
Unilateral side docking soldering: first welding since the soldering area of the side groove of K-type groove, and throat thickness is the docking estrade
8~10 times of width, to form unilateral docking area；
Back chipping: by the way of polishing or carbon arc air gouging, the other side groove opposite from unilateral docking area carries out docking estrade
It removes, the thickness of removing is greater than the width or height of docking estrade, will dock estrade and remove completely；
Ultrasound detection: ultrasound detection is carried out to the lug removed after docking estrade, using UT normal probe to the end of lug when detection
The sliding of Surface scan formula, it is whether thorough to detect back chipping；
Filling soldering: being filled soldering to the region removed after docking estrade, symmetrical with formation and unilateral docking area
Area is filled up in welding, to make the two sides of K-type groove structure having the same；
Symmetrical soldering: two staff are symmetrically welded the two sides of K-type groove, and the soldering area of two sides has been welded
It is whole.
2. the welding method of martensite heat-resistant steel lug weldment as described in claim 1, it is characterised in that: open up slope described
In the step of mouth, the opening gradient of the K-type groove on the ontology is less than the opening gradient of the K-type groove of the lug.
3. the welding method of martensite heat-resistant steel lug weldment as claimed in claim 2, it is characterised in that: the K of the lug
The opening gradient of type groove is 30 °~60 °, and the opening gradient of the K-type groove of the ontology is 10 °~15 °.
4. the welding method of martensite heat-resistant steel lug weldment as claimed in claim 2, it is characterised in that: the docking estrade
One end and K-type groove slope surface connect, dock estrade the other end be plane, the end of the K-type groove of the ontology is also set
Horizontalization face, so that the plane of the end of docking estrade is faced with the plane of the K-type groove of ontology and contacted.
5. the welding method of martensite heat-resistant steel lug weldment as described in claim 1, it is characterised in that: in back chipping step
In, using polishing or carbon arc air gouging remove the dock period of the day from 11 p.m. to 1 a.m, clear (area) be radius be greater than docking estrade width and height in compared with
The arc area being worth greatly does not stay defect in this way, guaranteeing that overlap joint estrade is removed completely.
6. the welding method of martensite heat-resistant steel lug weldment as claimed in claim 5, it is characterised in that: in the ultrasound inspection
It surveys in step, formula sliding is taken multiple scan for the end face of the lug of the surface of clear (area), to carry out emphasis to clear (area)
Detection, it is ensured that clear (area) zero defect.
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| CN201611059170.2A CN106670671B (en) | 2016-11-26 | 2016-11-26 | The welding method of martensite heat-resistant steel lug weldment |
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| CN201611059170.2A CN106670671B (en) | 2016-11-26 | 2016-11-26 | The welding method of martensite heat-resistant steel lug weldment |
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| CN106670671B true CN106670671B (en) | 2019-04-23 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108994472A (en) * | 2018-08-26 | 2018-12-14 | 大唐信阳发电有限责任公司 | A kind of steam turbine inlet sleeve docks technique for fixing with cylinder body |
| CN109759678B (en) * | 2019-02-27 | 2021-04-30 | 山东豪迈机械制造有限公司 | Welding method |
| CN114769789A (en) * | 2022-04-13 | 2022-07-22 | 太重（天津）滨海重型机械有限公司 | Method for processing groove |
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| CN106002008A (en) * | 2016-06-07 | 2016-10-12 | 中国水电四局(酒泉)新能源装备有限公司 | Method for welding door frame of ultra-low-temperature high-power wind turbine tower |
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|---|---|---|---|---|
| JPH09225635A (en) * | 1996-02-22 | 1997-09-02 | Kawasaki Heavy Ind Ltd | Melt-through bead welding method for connection of steelwork |
| CN101879645A (en) * | 2010-07-06 | 2010-11-10 | 蓬莱巨涛海洋工程重工有限公司 | Marine engineering large thick steel plate submerged arc welding process method in low-temperature environment |
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