CN202972110U

CN202972110U - All-welded ball valve body weld joint narrow gap welding connector structure

Info

Publication number: CN202972110U
Application number: CN2012206948112U
Authority: CN
Inventors: 不公告发明人
Original assignee: SICHUAN KEYCON (KCON) VALVE MANUFACTURING Co Ltd
Current assignee: SICHUAN KEYCON (KCON) VALVE MANUFACTURING Co Ltd
Priority date: 2012-12-14
Filing date: 2012-12-14
Publication date: 2013-06-05
Anticipated expiration: 2022-12-14

Abstract

The utility model discloses a welding connector structure, and particular relates to an all-welded ball valve body weld joint narrow gap welding connector structure which can avoid damage/burning of a sealing piece on a valve seat support ring by heat accumulating. The all-welded ball valve body weld joint narrow gap welding connector structure comprises a valve body and a left body which are matched with each other to form a welding groove. A square welding joint bottom is arranged at the center of the bottom portion of the welding groove which is in a U shape. Due to the fact that the U-shaped welding groove is used, the welding groove is narrow, the fact that padding size of the welding joint between the valve body and the left body is small is guaranteed, welding joint heat influence zone is small, the influence of heat final accumulating during a welding process on the sealing piece on the valve seat support ring is lowered to the minimum extent, welding quality and valve function integrity are guaranteed, and meanwhile the size of a valve is lowered to the minimum extent, and manufacturing cost is lowered to the minimum extent.

Description

All-welded ball valve valve body weld seam narrow gap welding interface structure

Technical field

The utility model 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 technique

Generally, for increasing work efficiency, the weld seam of all-welded ball valve is mainly adopted automatic/semi-automatic submerged arc welding, have efficient high, the advantage such as fusion penetration is large, and welding joint mechanical property is reliable.For the weld seam between valve body and left body, because the valve body wall thickness rate is thicker, according to conventional method design welding line joint groove, conventional welding line joint groove is V-shaped, and as shown in Figure 2, the volume that need to fill of valve body welding line joint is just larger so, weld interval can be long, the heat of valve in welding process finally accumulation can damage/burn Sealing on the valve seat bracing ring, thereby the sealability of valve is affected, and even loses efficacy.If but the final accumulation of the heat in the consideration welding process must cause the valve volume to increase on the impact of the Sealing on the valve seat bracing ring, manufacture cost increases.

The model utility content

Technical problem to be solved in the utility model is to provide a kind of all-welded ball valve valve body weld seam narrow gap welding interface structure of avoiding accumulation of heat to damage/burn Sealing on the valve seat bracing ring.

The all-welded ball valve valve body weld seam narrow gap welding interface structure that its technical problem that solves the utility model adopts, comprise valve body and left body, valve body and left body complement each other to form weld groove, and at the bottom of the bottom centre place of weld groove was provided with square weld seam, described weld groove took the shape of the letter U.Can adopt the gap and 1.5 of following size: 2mm at the bottom of square weld seam ^{+ 0.5}Root face.

Be 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 the symmetrical center line outer incline.

Further that the sidewall of described U-shaped weld groove and the angle of its symmetrical center line are 2 °.

The beneficial effects of the utility model are: owing to having adopted the U-shaped weld groove, therefore weld groove is narrower, thereby the packing volume that has guaranteed the weld seam between valve body and left body is less, weld heat-affected zone is less, the final accumulation of heat in welding process is minimum on the impact of the Sealing on the valve seat bracing ring, when guaranteeing welding quality and valve function integrity, it is minimum that the volume of valve reaches, and manufacture cost is minimum.Simultaneously, before welding preheating valve body and left body, therefore can make valve body and left body reach rapidly welding temperature, reduce the temperature gradient of valve body and left body in welding process, in order to guarantee valve body and left body interior tissue in the situation that affected by welding heat to change less, guarantee simultaneously in the situation that reduce still can carry out good welding with cross-ventilation, accumulation of heat.

Description of drawings

Fig. 1 is the schematic diagram of the utility model welding junction structure;

Fig. 2 is the schematic diagram of prior art welding junction structure;

Component, position and numbering in figure: valve body 1, left body 2, weld seam 3.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

The utility model comprises the following steps:

Weld groove 3 between A, making 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 be referring to shown in accompanying drawing 1, and the sectional shape of weld groove 3 takes the shape of the letter U, at the bottom of its bottom has the center to be provided with square weld seam.

B, according to valve body 1 chemical composition and the selected wlding of mechanical property with left body 2; Select correct wlding can improve weld strength.

C, before welding, adopt the mode preheating valve body 1 and left body 2 of flame heating, make its temperature reach 80～100 ℃; Preheating can make valve body 1 reach fast welding temperature with left body 2 when welding, and guarantees welding quality.

D, after preheating is complete, carry out multi-layer multi-pass welding.Welding is general adopts automatic/semi-automatic submerged arc welding to carry out welding.

Weld groove 3 sectional shapes of the present utility model take the shape of the letter U, and this compares the volume that conventional V-shaped weld has reduced a large amount of fillings, therefore can reduce the accumulation of heat, avoid the Sealing on the valve seat bracing ring to be damaged.Simultaneously, from the bottom to the welding process of top, soldering point can be gradually near the Sealing on bracing ring, this is that almost identical at the packing volume of unit height, accumulation of heat is less because the sidewall of U-shaped weld groove 3 is almost vertical.And conventional V-shaped weld sidewall is outward-dipping, and opening enlarges gradually, and near the Sealing on bracing ring, the packing volume of its unit height increases soldering point gradually more, and it is serious at the top accumulation of heat.The utility model has carried out preheating to valve body 1 and left body 2 when reducing packing volume, valve body 1 can reach welding temperature fast with left body 2 when welding like this, and preheating temperature only has 80～100 ℃, can not have influence on the Sealing on bracing ring.Accumulation of heat when so both having reduced welding also can reach welding temperature fast when welding.Can realize reliable welding, also can reduce accumulation of heat, thereby avoid the damage of the Sealing on the bracing ring.

Concrete, the angle a of the sidewall of described U-shaped weld groove 3 and its symmetrical center line is 1～5 °, described U-shaped weld groove 3 is to the symmetrical center line outer incline.Preferred angle a is 2 °.The opening of U-shaped weld groove 3 is less times greater than the bottom, and more easily operation when welding like this is convenient to the bottom weldering full.Less angle can be not too much yet increase welding packing volume.

Embodiment

Take certain model high-pressure heavy caliber all-welded as example, its weld groove 3 is set to the U-shaped weld seam, and a is 2 °, and weld seam A/F W width numerical value is definite according to throat depth, and the general large weld seam of 100mm thickness, W width value are the 22mm left and right.General requirement be root of weld width greatly in 13～15mm scope, groove root weld quality safety reliably according to concrete welding situation, can suitably be regulated a value (angle) when guaranteeing welding, regulates distance between the toes of a weld., its main material chemical composition and mechanical property such 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.

80～100 ℃ of the mode preheating temperatures of employing flame heating.

Weld welding parameter such as following table after preheating

After welding is complete, after completing according to predetermined welding procedure welding, carry out Product Validation.Product Validation carries out according to the GB of valve.The product performance of this routine product see the following form:

Weld defects is not found in the weld seam process UT non-destructive inspection of adopting this routine welding procedure welding to complete, is judged to be the I level qualified.The conventional pressure integrity test of whole valve is also qualified.

Can find out from this example, adopt technique of the present utility model and structure can reduce the packing volume of weld seam, reduce accumulation of heat; And its valve of producing meets the requirements fully.

Claims

1. all-welded ball valve valve body weld seam narrow gap welding interface structure, comprise valve body (1) and left body (2), valve body (1) and left body (2) complement each other to form weld groove (3), at the bottom of the bottom centre place of weld groove (3) was provided with square weld seam, it is characterized in that: described weld groove (3) took the shape of the letter U.

2. all-welded ball valve valve body weld seam narrow gap welding interface structure as claimed in claim 1, it is characterized in that: 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 the symmetrical center line outer incline.

3. all-welded ball valve valve body weld seam narrow gap welding interface structure as claimed in claim 2, it is characterized in that: the sidewall of described U-shaped weld groove (3) and the angle a of its symmetrical center line are 2 °.