CN104148819A - Welding method and welding joint for butt weld of cast steel pipe and hot rolled steel pipe - Google Patents
Welding method and welding joint for butt weld of cast steel pipe and hot rolled steel pipe Download PDFInfo
- Publication number
- CN104148819A CN104148819A CN201410333866.4A CN201410333866A CN104148819A CN 104148819 A CN104148819 A CN 104148819A CN 201410333866 A CN201410333866 A CN 201410333866A CN 104148819 A CN104148819 A CN 104148819A
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- Prior art keywords
- steel pipe
- welding
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- steel
- cast steel
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Classifications
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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
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
- B23K33/004—Filling of continuous seams
- B23K33/006—Filling of continuous seams for cylindrical workpieces
-
- 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
- B23K31/027—Making tubes with soldering or welding
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a welding method and a welding joint for a butt weld of a cast steel pipe and a hot rolled steel pipe. The welding joint comprises a welding joint portion formed by weld ends of the hot rolled steel pipe and the cast steel pipe, the welding joint portion comprises two grooves and a base plate, the two grooves are formed in the weld ends of the hot rolled steel pipe and the cast steel pipe, the base plate extends from the weld end of the cast steel pope to the inner periphery of the hot rolled steel pipe, the distance from the top of the base plate to the outer periphery of the cast steel pipe is equal to the wall thickness of the hot rolled steel pipe, and the bottom of the base plate and the inner periphery of the cast steel pipe are in slope transition. The welding method includes the steps of integral casting of the steel pipes, machining of the grooves and the base plate, butt welding for connection and the like. The welding method and the welding joint have the advantages that welding difficulty can be lowered, stress concentration and residual stress generated in welding can be weakened, fatigue performance under reciprocate load effect is effectively improved, surplus height of the butt weld is reduced, and a welded product can acquire better appearance effects.
Description
Technical field
The present invention relates to the Type of Welding of a kind of cast steel steel pipe and hot finished steel pipe, in particular, welding point and welding method thereof when the present invention is applicable in the fields such as large-span steel, bridge, ocean platform that the larger cast steel steel pipe hot finished steel pipe butt weld less with wall thickness of wall thickness is connected.
Background technology
Existing " Code for design of steel structures " (GB50017-2003) in, only the fatigue problem of member has been adopted to allowable stress method analysis, but the fatigue problem at Member Welding place is not claimed; And " cast steel steel pipe application technology code " (CECS235:2008) in, although proposed the application form of several cast steel steel pipes, the fatigue problem of cast steel steel pipe and welding position thereof is not analyzed, is calculated and illustrates; The most frequently used " welding handbook ", specification is made in the welding procedure that does not also have butt welded seam both sides wall thickness to differ larger.
Those skilled in the art are known, fetch for the soldered of cast steel steel pipe and hot finished steel pipe, even if cast steel steel pipe is identical with the external diameter of hot finished steel pipe, but because the wall thickness of cast steel steel pipe is greater than the wall thickness of hot finished steel pipe, therefore in the time that the thickness of bi-material differs larger, be easy to cause the inhomogeneous of weld geometry, and cause the finished product after welding obviously to have residual stress and weld defect, cause near the residual tension of base metal weld seam often to reach the yield point of steel, and the most responsive region of formation and development fatigue crack just, this position.
In sum, at present in engineering and all reckon without the fatigue problem at cast steel steel-pipe welding place in aforesaid various design specification, technical regulation and welding handbook, and the existence of this blank is that the weldment that cast steel steel pipe and hot finished steel pipe are formed by connecting cannot meet the key factor that under reciprocating load, engineering requires.
Summary of the invention
Object of the present invention overcomes the above problems exactly, and a kind of welding point and welding method for cast steel steel pipe and hot finished steel pipe butt weld is provided for this reason.The enforcement of the method, will effectively reduce the residual stress of weld, particularly reduces its stress under Cyclic Loading state and concentrates, thereby improve its fatigue behaviour.
One of technical scheme of the present invention is:
A kind of welding point for cast steel steel pipe and hot finished steel pipe butt weld, comprise the welding point position being formed by cast steel steel pipe and hot finished steel pipe welding ends, described welding point position comprises described cast steel steel pipe and hot finished steel pipe two grooves at welding ends, also comprise the backing plate that is extended to hot finished steel pipe internal diameter by the welding ends of described cast steel steel pipe, the top of described backing plate equals the wall thickness of described hot finished steel pipe to the distance of described cast steel outer diameter of steel pipes, the bottom of described backing plate is gradient transition to the internal diameter of described cast steel steel pipe.
The bottom gap of two described grooves is 6mm, and the angle between two described grooves is 45 °.
The thickness of described backing plate is 4～6mm, and the length of described backing plate is 20～30mm.
Described backing plate bottom is 1:6～1:5 to the inclination ratio of described cast steel pipe diameter gradient transition.
Two of technical scheme of the present invention is:
Adopt an aforementioned welding method that is connected cast steel steel pipe and hot finished steel pipe for cast steel steel pipe with the welding point of hot finished steel pipe butt weld, comprise the following steps:
(1) monoblock cast cast steel steel pipe, and in the time of monoblock cast, reserve groove and backing plate;
(2) groove of machining the described hot finished steel pipe welding ends of polishing;
(3) groove and the backing plate of machining the described cast steel steel-pipe welding end of polishing, make described backing plate top to the distance of described cast steel outer diameter of steel pipes equal the wall thickness of hot finished steel pipe, and make described backing plate bottom to the inclination ratio of described cast steel pipe diameter between 1:6～1:5;
(4) adopt the mode of multilayer weld, continuous sequence that described cast steel steel pipe is docked and is integrated with hot finished steel pipe.
The present invention is for welding point and the welding method thereof of cast steel steel pipe and hot finished steel pipe butt weld, take into full account the fatigue problem at the cast steel steel-pipe welding place all reckoning without in existing engineering and various existing design specification, technical regulation and welding handbook, met thereby grasped the weldment being formed by connecting with cast steel steel pipe and hot finished steel pipe the key factor that under reciprocating load, engineering requires.
Beneficial effect of the present invention is:
(1) reserved groove and backing plate in the time of monoblock cast, can reduce welding difficulty, and reduce the residual stress that stress is concentrated and welding produces of welding position;
The reasonable setting of angle and back plate sizes and gradient transition inclination ratio between (2) two groove bottom gaps, two grooves, the stress that can further reduce weld is concentrated, stress is seamlessly transitted, effectively improve the fatigue behaviour under reciprocating load;
(3), when butt weld connects described cast steel steel pipe and hot finished steel pipe, the employing of multilayer weld, continuous sequence mode, can reduce weld reinforcement, makes welding product obtain better appearance effect.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention for cast steel steel pipe and hot finished steel pipe butt weld welding point.
Fig. 2 is the enlarged drawing at welding point position in Fig. 1.
Mark in figure: 1-cast steel steel pipe, 2-hot finished steel pipe, 3-welding point position, 4-groove, 5-backing plate.
Detailed description of the invention
For the present invention is more easily understood, below in conjunction with drawings and Examples, technical scheme of the present invention is described in further detail:
With reference to Fig. 1, the present invention is for the welding point of cast steel steel pipe and hot finished steel pipe butt weld, and its structure comprises the welding point position 3 being made up of the welding ends of cast steel steel pipe 1 and hot finished steel pipe 2, and described welding point position 3 is made up of groove 4 and backing plate 5.
In above-mentioned setting:
Described groove 4 comprises cast steel steel pipe 1 and two grooves of hot finished steel pipe 2 in weld seam junction, and the gap size of two groove bottoms is 6mm, and the angle α between two grooves is 45 °;
Described backing plate 5 forms by the welding ends machining of cast steel steel pipe 1 and through polishing, and its gauge is 4～6mm, and its length dimension need to be selected according to the state in when welding between 20～30mm;
The bottom of described backing plate 5 is gradient transition to the interior warp of described cast steel steel pipe 1, and the inclination ratio of this gradient is 1:6～1:5.
The present invention adopts butt weld to connect the method for cast steel steel pipe and hot finished steel pipe, comprises the following steps:
(1) the cast steel steel pipe 1 described in monoblock cast and described hot finished steel pipe 2, the residual stress the convenient welding that bring in order to reduce flame cutting should be reserved groove 4 and backing plate 5, and make the requirement in its satisfied casting standard in the time of monoblock cast;
(2) groove 4 of machining polish described hot finished steel pipe 2, welding ends;
(3) groove 4 and the backing plate 5 of machining polish described cast steel steel pipe 1, welding ends, and require described backing plate 5 tops to the distance of described cast steel steel pipe 1 external diameter to equal the wall thickness of described hot finished steel pipe 2, so that the weld seam after welding is tending towards smooth; Concentrate for the stress that further reduces weld, also should make described backing plate 5 bottoms as far as possible less than normal between 1:6～1:5 to the inclination ratio of described cast steel steel pipe 1 internal diameter;
(4) carry out described cast steel steel pipe 1 and be connected with the butt weld of described hot finished steel pipe 2, and in the time of welding, adopt the mode of multilayer weld, continuous sequence, to reduce weld reinforcement as far as possible.
In the present invention, the casting of described cast steel steel pipe 1, the reserved setting of machining, polishing and the welding operation of described hot finished steel pipe 2 and groove 4 and backing plate 5 all should meet existing China Engineering Construction Standardization Association " cast steel node application technology code " (CECS235:2008), " construction steel structure solder technology code " (JGJ81-2002) and " during welding for steel structure specification " codes and standards (GB50661-2011).
With reference to drawings and Examples, technical scheme of the present invention is schematically described above, this description does not have restricted.Those skilled in the art will be understood that, the set-up mode of butt weld welding point and adopt this butt weld welding point to connect the welding method of cast steel steel pipe and hot finished steel pipe in the present invention, all slight modifications in actual applications, and other staff also may make the design similar to the present invention under its enlightenment.Special needs to be pointed out is: only otherwise depart from design aim of the present invention, all apparent changes or similar Design, within being all included in protection scope of the present invention.
Claims (6)
1. the welding point for cast steel steel pipe and hot finished steel pipe butt weld, comprise the welding point position being formed by cast steel steel pipe and hot finished steel pipe welding ends, it is characterized in that: described welding point position comprises cast steel steel pipe and hot finished steel pipe at two grooves of welding ends and extended to the backing plate of hot finished steel pipe internal diameter by the welding ends of described cast steel steel pipe, the top of described backing plate equals the wall thickness of described hot finished steel pipe to the distance of described cast steel outer diameter of steel pipes, the bottom of described backing plate is gradient transition to the internal diameter of described cast steel steel pipe.
2. the welding point for cast steel steel pipe and hot finished steel pipe butt weld according to claim 1, is characterized in that: the bottom gap of two described grooves is 6mm.
3. the welding point for cast steel steel pipe and hot finished steel pipe butt weld according to claim 1, is characterized in that: the angle between two described grooves is 45 °.
4. the welding point for cast steel steel pipe and hot finished steel pipe butt weld according to claim 1, is characterized in that: the thickness of described backing plate is 4～6mm, the length of described backing plate is 20～30mm.
5. the welding point for cast steel steel pipe and hot finished steel pipe butt weld according to claim 1, is characterized in that: described backing plate bottom is 1:6～1:5 to the inclination ratio of described cast steel pipe diameter gradient transition.
6. adopt a welding method that is connected cast steel steel pipe and hot finished steel pipe for cast steel steel pipe with the welding point of hot finished steel pipe butt weld claimed in claim 1, it is characterized in that: it comprises the following steps:
(1) monoblock cast cast steel steel pipe and hot finished steel pipe, and in the time of monoblock cast, reserve groove and backing plate;
(2) polishing mechanical machining are stated the groove of hot finished steel pipe welding ends;
(3) polishing mechanical machining are stated groove and the backing plate of cast steel steel-pipe welding end, make described backing plate top to the distance of described cast steel outer diameter of steel pipes equal the wall thickness of hot finished steel pipe, and make described backing plate bottom to the inclination ratio of described cast steel pipe diameter between 1:6～1:5;
(4) connect cast steel steel pipe and hot finished steel pipe with the mode butt welding of multilayer weld, continuous sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410333866.4A CN104148819A (en) | 2014-07-14 | 2014-07-14 | Welding method and welding joint for butt weld of cast steel pipe and hot rolled steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410333866.4A CN104148819A (en) | 2014-07-14 | 2014-07-14 | Welding method and welding joint for butt weld of cast steel pipe and hot rolled steel pipe |
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| Publication Number | Publication Date |
|---|---|
| CN104148819A true CN104148819A (en) | 2014-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410333866.4A Pending CN104148819A (en) | 2014-07-14 | 2014-07-14 | Welding method and welding joint for butt weld of cast steel pipe and hot rolled steel pipe |
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| CN (1) | CN104148819A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104874896A (en) * | 2015-05-07 | 2015-09-02 | 青岛海西重机有限责任公司 | Welding method of Q690 high-strength steel pipe for truss jib of large-scale marine crane |
| CN106825972A (en) * | 2017-02-24 | 2017-06-13 | 江阴中南重工有限公司 | A kind of welding method of pipe fitting |
| CN106969165A (en) * | 2017-05-09 | 2017-07-21 | 新地能源工程技术有限公司 | The standard attachment structure of small-aperture ball valve, stop valve |
| CN108951859A (en) * | 2018-08-23 | 2018-12-07 | 北京京城环保股份有限公司 | Using the construction steel structure composite node of CrNiMn high alloy wlding and cast welding construction |
| CN114985884A (en) * | 2022-06-01 | 2022-09-02 | 中船黄埔文冲船舶有限公司 | Method for shielding numerical control cutting groove |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE424825B (en) * | 1973-10-11 | 1982-08-16 | Rockwell International Corp | WELDING CONFIGURATION AND WEDDING TO WELD TOGETHER TWO WORK PIECES. |
| CN201159346Y (en) * | 2008-01-04 | 2008-12-03 | 詹韬 | Novel connecting structure for thin wall stainless steel tube |
| CN101758335A (en) * | 2009-10-21 | 2010-06-30 | 上海锅炉厂有限公司 | Improved heterogenous steel pipe mechanical welding butt joint divided edge |
| CN102363236A (en) * | 2011-10-08 | 2012-02-29 | 阮继成 | Metal pipe fitting welding method and metal pipe fitting welding component |
| CN203945003U (en) * | 2014-07-14 | 2014-11-19 | 天津大学 | A kind of welding point for cast steel steel pipe and hot finished steel pipe butt weld |
-
2014
- 2014-07-14 CN CN201410333866.4A patent/CN104148819A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE424825B (en) * | 1973-10-11 | 1982-08-16 | Rockwell International Corp | WELDING CONFIGURATION AND WEDDING TO WELD TOGETHER TWO WORK PIECES. |
| CN201159346Y (en) * | 2008-01-04 | 2008-12-03 | 詹韬 | Novel connecting structure for thin wall stainless steel tube |
| CN101758335A (en) * | 2009-10-21 | 2010-06-30 | 上海锅炉厂有限公司 | Improved heterogenous steel pipe mechanical welding butt joint divided edge |
| CN102363236A (en) * | 2011-10-08 | 2012-02-29 | 阮继成 | Metal pipe fitting welding method and metal pipe fitting welding component |
| CN203945003U (en) * | 2014-07-14 | 2014-11-19 | 天津大学 | A kind of welding point for cast steel steel pipe and hot finished steel pipe butt weld |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104874896A (en) * | 2015-05-07 | 2015-09-02 | 青岛海西重机有限责任公司 | Welding method of Q690 high-strength steel pipe for truss jib of large-scale marine crane |
| CN106825972A (en) * | 2017-02-24 | 2017-06-13 | 江阴中南重工有限公司 | A kind of welding method of pipe fitting |
| CN106969165A (en) * | 2017-05-09 | 2017-07-21 | 新地能源工程技术有限公司 | The standard attachment structure of small-aperture ball valve, stop valve |
| CN108951859A (en) * | 2018-08-23 | 2018-12-07 | 北京京城环保股份有限公司 | Using the construction steel structure composite node of CrNiMn high alloy wlding and cast welding construction |
| CN114985884A (en) * | 2022-06-01 | 2022-09-02 | 中船黄埔文冲船舶有限公司 | Method for shielding numerical control cutting groove |
| CN114985884B (en) * | 2022-06-01 | 2023-09-19 | 中船黄埔文冲船舶有限公司 | Method for shielding numerical control cutting groove |
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Application publication date: 20141119 |