CN103008851B - All-welded ball valve body weld narrow-gap welding process and interface structure - Google Patents
All-welded ball valve body weld narrow-gap welding process and interface structure Download PDFInfo
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- CN103008851B CN103008851B CN201210544194.2A CN201210544194A CN103008851B CN 103008851 B CN103008851 B CN 103008851B CN 201210544194 A CN201210544194 A CN 201210544194A CN 103008851 B CN103008851 B CN 103008851B
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Abstract
The invention discloses a welding process and particularly relates to an all-welded ball valve body weld narrow-gap welding process. The all-welded ball valve body weld narrow-gap welding process which is provided by invention and can prevent heat from being accumulated and damaging/burning out a sealing element on a valve seat supporting ring comprises the following steps of: A) making a weld groove between a valve body and a left body, wherein the weld groove is U-shaped; B) selecting welding materials according to the chemical components and the mechanical properties of the valve body and the left body; C) before welding, preheating the valve body and the left body by adopting a flame heating method to enable the temperature of the valve body and the left body to reach 80-100DEG C; and D) after preheating, conducting multilayer multi-pass welding. Since the U-shaped weld groove is adopted, the weld groove is narrower, the filling volume of the weld between the valve body and the left body is ensured to be small, the heat-affected zone of the weld is smaller and the influence of the finally accumulated heat during welding on the sealing element on the valve seat supporting ring is minimized.
Description
Technical field
The present invention relates to a kind of welding procedure, especially a kind of all-welded ball valve valve body weld seam narrow gap welding technology.In addition, the invention still further relates to a kind of welding junction structure, especially a kind of all-welded ball valve valve body weld seam narrow gap welding interface structure.
Background technology
Generally, for increasing work efficiency, mainly adopting automatic/semi-automatic submerged-arc welding, have efficiency high to the weld seam of all-welded ball valve, fusion penetration is large, the advantages such as welding joint mechanical property is reliable.For the weld seam between valve body and left body, because valve body wall thickness rate is thicker, conventionally design welding line joint groove, conventional welding line joint groove is V-shaped, and as shown in Figure 2, so valve body welding line joint needs the volume of filling just larger, weld interval can be long, the heat of valve in welding process finally accumulation can damage/burn the seal on valve seat bracing ring, thus the sealing property of valve is affected, and even loses efficacy.If but the heat in consideration welding process finally accumulates the impact on the seal on valve seat bracing ring, and valve volume must be caused to increase, manufacturing cost increases.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of all-welded ball valve valve body weld seam narrow gap welding technology avoiding accumulation of heat to damage/burn seal on valve seat bracing ring.
The present invention solves the all-welded ball valve valve body weld seam narrow gap welding technology that its technical problem adopts, and comprises the following steps:
A, make weld groove between valve body and left body, weld groove takes the shape of the letter U;
B, select wlding according to the chemical composition of valve body and left body and mechanical property;
C, before welding, adopts the mode preheating valve body of flame heating and left body, makes its temperature reach 80 ~ 100 DEG C;
D, after preheating, carry out multi-layer multi-pass welding.
Further, in D step, automatic/semi-automatic submerged-arc welding is adopted to carry out welding.
Further, multi-layer multi-pass welding adopts following table parameter:
Further, the sidewall of described U-shaped weld groove and the angle of its symmetrical center line are 1 ~ 5 °, and described U-shaped weld groove is to symmetrical center line outer incline.
Further, the sidewall of described U-shaped weld groove and the angle of its symmetrical center line are 2 °.
Another technical problem that will solve of the present invention is to provide a kind of all-welded ball valve valve body weld seam narrow gap welding interface structure avoiding accumulation of heat to damage/burn seal on valve seat bracing ring.
All-welded ball valve valve body weld seam narrow gap welding interface structure provided by the invention, comprise valve body and left body, valve body and left body complement each other to form weld groove, and the place of bottom centre of weld groove is provided with at the bottom of square weld seam, and described weld groove takes the shape of the letter U.Following size can be adopted: the gap of 2mm and 1.5 at the bottom of square weld seam
+ 0.5root face.
Further, the sidewall of described U-shaped weld groove and the angle of its symmetrical center line are 1 ~ 5 °, and described U-shaped weld groove is to symmetrical center line outer incline.
Further, the sidewall of described U-shaped weld groove and the angle of its symmetrical center line are 2 °.
The invention has the beneficial effects as follows: owing to have employed U-shaped weld groove, therefore weld groove is narrower, thus ensure that the packing volume of the weld seam between valve body and left body is less, weld heat-affected zone is less, heat in welding process is finally accumulated the impact of the seal on valve seat bracing ring minimum, while guarantee welding quality and valve function integrality, the volume of valve reaches minimum, and manufacturing cost is minimum.Simultaneously, preheating valve body and left body before welding, therefore valve body and left body can be made to reach welding temperature rapidly, reduce the thermograde of valve body and left body in welding process, so that it is less to guarantee that valve body and left body interior tissue change when affecting by welding heat in welding process, ensure still can carry out good welding when reducing with cross-ventilation, accumulation of heat simultaneously.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of welding junction structure of the present invention;
Fig. 2 is the schematic diagram of prior art welding junction structure;
Parts, position and numbering in figure: valve body 1, left body 2, weld groove 3, weld seam A/F W.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
The present invention includes following steps:
A, make weld groove 3 between valve body 1 and left body 2, weld groove 3 takes the shape of the letter U; Weld groove 3 generally processes when processing valve body 1 and pedestal 2, and its concrete shape can see shown in accompanying drawing 1, and the cross sectional shape of weld groove 3 takes the shape of the letter U, and has center to be provided with at the bottom of square weld seam bottom it.
B, select wlding according to the chemical composition of valve body 1 and left body 2 and mechanical property; Correct wlding is selected to improve weld strength.
C, before welding, adopts the mode preheating valve body 1 of flame heating and left body 2, makes its temperature reach 80 ~ 100 DEG C; Preheating can make valve body 1 reach welding temperature with left body 2 fast when welding, and ensures welding quality.
D, after preheating, carry out multi-layer multi-pass welding.Welding is general adopts automatic/semi-automatic submerged-arc welding to carry out welding.
Weld groove 3 cross sectional shape of the present invention takes the shape of the letter U, and this compares the volume that conventional V-shaped weld decreases a large amount of fillings, therefore can reduce the accumulation of heat, avoid the seal on valve seat bracing ring to be damaged.Meanwhile, from bottom in the welding process of top, pad can not seal gradually on bracing ring, this is because the sidewall of U-shaped weld groove 3 is almost vertical, almost identical at the packing volume of unit height, accumulation of heat is less.And the V-shaped weld sidewall of routine is outward-dipping, opening expands gradually, the seal of pad more on bracing ring, and the packing volume of its unit height increases gradually, and it is serious at top accumulation of heat.The present invention, while minimizing packing volume, has carried out preheating to valve body 1 and left body 2, and when welding, valve body 1 and left body 2 can reach welding temperature fast like this, and preheat temperature only has 80 ~ 100 DEG C, can not have influence on the seal on bracing ring.So both decreasing accumulation of heat during welding, also reach welding temperature fast when welding.Reliable welding can be realized, also can reduce accumulation of heat, thus avoid the damage of the seal on bracing ring.
Concrete, the sidewall of described U-shaped weld groove 3 and the angle a of its symmetrical center line are 1 ~ 5 °, and described U-shaped weld groove 3 is to symmetrical center line outer incline.Preferred angle a is 2 °.The opening of U-shaped weld groove 3, less times greater than bottom, more easily operates when welding like this, is convenient to full for bottom weldering.Less angle also can not be too much increase welding packing volume.
Embodiment
For certain model high-pressure heavy caliber all-welded, its weld groove 3 is set to U-shaped weld seam, and a is 2 °, and weld seam A/F W width numerical value is determined according to throat depth, and the weld seam that general 100mm thickness is large, W width value is about 22mm.General requirement be root of weld width greatly within the scope of 13 ~ 15mm, the welding situation that during to ensure to weld, groove root welding quality safe and reliable basis is concrete, suitably can regulate a value (angle), regulate weld width.Its main material chemical composition and mechanical property are as following table:
According to chemical composition and the mechanical property of above mother metal, determine to adopt automatic submerged arc welding to carry out welding, select wlding GB/T5293F5A4-H10Mn2
Adopt the mode preheat temperature 80 ~ 100 DEG C of flame heating.
Weld after preheating, welding parameter is as following table
After welding, after completing according to predetermined welding procedure welding, carry out Product Validation.Product Validation carries out according to the GB of valve.The properties of product of this routine product see the following form:
Adopt weld seam that this routine welding procedure has been welded through UT Non-Destructive Testing, do not find weld defect, be judged to be that I level is qualified.The normal pressures leakage test of whole valve is also qualified.
As can be seen from this example, adopt technique of the present invention and structure can reduce the packing volume of weld seam, reduce accumulation of heat; And its valve produced meets the requirements completely.
Claims (4)
1. all-welded ball valve valve body weld seam narrow gap welding technology, is characterized in that: comprise the following steps:
A, make valve body (1) and left body (2) between weld groove (3), weld groove (3) takes the shape of the letter U;
B, select wlding according to the chemical composition of valve body (1) and left body (2) and mechanical property;
C, before welding, adopts mode preheating valve body (1) and the left body (2) of flame heating, makes its temperature reach 80 ~ 100 DEG C;
D, after preheating, carry out multi-layer multi-pass welding, multi-layer multi-pass welding adopts following table parameter:
2. all-welded ball valve valve body weld seam narrow gap welding technology as claimed in claim 1, is characterized in that: in D step, adopts automatic/semi-automatic submerged-arc welding to carry out welding.
3. all-welded ball valve valve body weld seam narrow gap welding technology as claimed in claim 1, it is characterized in that: the described sidewall of U-shaped weld groove (3) and the angle a of its symmetrical center line are 1 ~ 5 °, described U-shaped weld groove (3) is to symmetrical center line outer incline.
4. all-welded ball valve valve body weld seam narrow gap welding technology as claimed in claim 3, is characterized in that: the described sidewall of U-shaped weld groove (3) and the angle a of its symmetrical center line are 2 °.
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| CN103008851B true CN103008851B (en) | 2015-04-15 |
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| JP6730927B2 (en) * | 2014-01-24 | 2020-07-29 | エレクトリック パワー リサーチ インスチテュート インコーポレイテッド | Products for welded joints with step design |
| CN103982673A (en) * | 2014-05-29 | 2014-08-13 | 昆山维萨阀门有限公司 | All-welded ball valve |
| CN106552985A (en) * | 2015-09-29 | 2017-04-05 | 嘉兴五洲阀门有限公司 | A kind of welding procedure of valve neck seat angle welding |
| CN106881518A (en) * | 2015-12-15 | 2017-06-23 | 嘉兴五洲阀门有限公司 | A kind of welding procedure of valve body circumferential welded seam |
| CN105618904B (en) * | 2016-02-23 | 2018-10-16 | 中信重工机械股份有限公司 | A kind of assembling and welding process of the narrow-clearance submerged arc welding divided edge structure of large thick-wall oil cylinder |
| CN105921871A (en) * | 2016-06-03 | 2016-09-07 | 江苏威尔迪威阀业有限公司 | Integrated molding welding method of large-caliber all-welded ball valve |
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| CN111001960B (en) * | 2019-12-18 | 2021-06-11 | 安德里茨（中国）有限公司 | Yankee cylinder section pre-processing piece and method for manufacturing Yankee cylinder |
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| CN202972110U (en) * | 2012-12-14 | 2013-06-05 | 四川精控阀门制造有限公司 | All-welded ball valve body weld joint narrow gap welding connector structure |
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Patent Citations (6)
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| CN1714978A (en) * | 2004-06-30 | 2006-01-04 | 上海锅炉厂有限公司 | Process and device for automatic argon arc welding and narrow gap burial arc welding for circular pipe header seam |
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