CN105689847A

CN105689847A - Surfacing process for sealing surface

Info

Publication number: CN105689847A
Application number: CN201410688414.8A
Authority: CN
Inventors: 彭波
Original assignee: Chongqing City Banan District Yongxing Machinery Factory
Current assignee: Chongqing City Banan District Yongxing Machinery Factory
Priority date: 2014-11-26
Filing date: 2014-11-26
Publication date: 2016-06-22

Abstract

The invention discloses a surfacing process for a sealing surface. The surfacing process comprises the following steps of 1) operation: 1.1) checking the integrity of a welding machine before welding; and 1.2) preparing for a workpiece to be welded; 2) carrying out post-weld treatment: 2.1) placing the welded workpiece on the dry ground or in a dry sand (dry lime) trough, but not placing the welded workpiece on the humid ground or a water splashing place; 2.2) burying a small workpiece (a valve clack and a gate) in dry sand to slowly cool to ensure that the workpiece is in an as-normalized condition; and 3) checking. The surfacing process is simple in operation, low in operator experience requirement and high in product quality.

Description

A kind of sealing surface weld deposit technique

Technical field

The present invention relates to a kind of sealing surface weld deposit technique。

Background technology

The adjustment in processing step and device parameter etc. of the existing sealing surface weld deposit technique there is also certain empirical and technical, for the operator newly started with, in addition it is also necessary to carry out substantial amounts of exercise and could grasp operation skill, produces the good product of quality。

Summary of the invention

In order to realize the purpose of the present invention, the present invention provides the sealing surface weld deposit technique of a kind of easy to operate, quick, easy left-hand seat。

For solving above-mentioned technical problem, the present invention adopts the following technical scheme that

A kind of sealing surface weld deposit technique, comprises the steps:

1), operating procedure:

1.1), the integrity of butt welding machine is answered to check before welding；

1.2) preparation of workpiece, is welded:

1.2.1), must carrying out the workpiece of built-up welding first by groove face processing machine surfacing part, its size has to comply with drawing requirement；

1.2.2), with the compression clean welding position of air blow drying and inner chamber before welding；

1.2.3), to inside nominal diameter more than 150, apply oxy arc before the nominal pressure valve body built-up welding more than 2.5MPa and preheat around sealing surface；

1.2.4) workpiece, to built-up welding STL alloy, can carry out built-up welding after all preheating with oxy arc, and its preheating temperature is 300-600oC；

2), after welding treatment:

2.1), the workpiece that welds must be positioned in dry ground or dry husky (dry lime) groove, never accurate be positioned over wet ground or the place having water to splash；

2.2), for small workpiece (flap, flashboard), apply dry sand and bury, allow its Slow cooling, make workpiece be in normalized condition；

3), inspection。

Further, also include

4), environmental requirement:

4.1), welding should carry out in indoor, and welding place should wind sheltering；

4.2), place be not allow for water stain, more not in the place welding having hydrops；

4.3), relative humidity more than 90%, when ambient temperature is lower than 5oC, do not allow welding。

Further, also include

5), built-up welding requires:

5.1), built-up welding time, adopt level welding, arc manipulation speed is uniform, must not teeter, adopt short arc welding；

5.2) after, being soldered one layer, it is necessary to thoroughly remove slag and can carry out second layer welding；

5.3), for the built-up welding (width is more than 30mm) of wide sealing surface, should the built-up welding layer by layer from both sides, centre is finally filled up, to reduce welding stress。

The present invention is simple to operate, and operator's skill requirement is low, and product quality is high。

Detailed description of the invention

Below in conjunction with embodiment, the invention will be further described:

A kind of sealing surface weld deposit technique, comprises the steps:

1), environmental requirement:

1.1), welding should carry out in indoor, and welding place should wind sheltering；

1.2), place be not allow for water stain, more not in the place welding having hydrops；

1.3), relative humidity more than 90%, when ambient temperature is lower than 5oC, do not allow welding；

2), operating procedure:

2.1), the integrity of butt welding machine is answered to check before welding；

2.2) preparation of workpiece, is welded:

2.2.1), must carrying out the workpiece of built-up welding first by groove face processing machine surfacing part, its size has to comply with drawing requirement；

2.2.2), with the compression clean welding position of air blow drying and inner chamber before welding；

2.2.3), to inside nominal diameter more than 150, apply oxy arc before the nominal pressure valve body built-up welding more than 2.5MPa and preheat around sealing surface；

2.2.4) workpiece, to built-up welding STL alloy, can carry out built-up welding after all preheating with oxy arc, and its preheating temperature is 300-600oC；

3), built-up welding requires:

3.1), built-up welding time, adopt level welding, arc manipulation speed is uniform, must not teeter, adopt short arc welding；

3.2) after, being soldered one layer, it is necessary to thoroughly remove slag and can carry out second layer welding；

3.3), for the built-up welding (width is more than 30mm) of wide sealing surface, should the built-up welding layer by layer from both sides, centre is finally filled up, to reduce welding stress；

4), after welding treatment:

4.1), the workpiece that welds must be positioned in dry ground or dry husky (dry lime) groove, never accurate be positioned over wet ground or the place having water to splash；

4.2), for small workpiece (flap, flashboard), apply dry sand and bury, allow its Slow cooling, make workpiece be in normalized condition；

5), inspection:

5.1), the workpiece that Quality Inspector's reply welds carries out on-the-spot full inspection；

5.2), visual weld bead quality requires:

5.3), face of weld must not have crackle, pore and field trash；

5.4), weld seam must not exceed more than body plane 3.0mm；

5.5), weld seam be not allow for serious undercut phenomenon, i.e. the undercut degree of depth is not more than 0.5mm, and undercut continuous length is not more than 100mm；

5.6), penetrating inspection requires: undertaken by JB/T4730 requirement；

5.7), should show without any dependent linearity；

5.8), should without the associated circular vestige of more than 5mm in key dimension face；

5.9), on the same line, must not have 4 or more than 4 intervals less than 1.6mm(limit to limit) associated circular vestige；

5.10), in region, pressure contact seal face, must not there is any relevant vestige；

6, Hardness Surveillance:

6.1) making a sample block, in a lot, sealing surface surface is carried out machining, after its processing, overlay cladding thickness is drawing requirement minimum thickness；

6.2), carrying out hardness number mensuration at overlay cladding, whole circumference up sampling point is not less than 5, and inside nominal diameter is more than 100, and sample point is not less than 8；

6.3), the distribution of sample point should be distributed at even circumferential, take into account diametric(al) simultaneously；

6.4), all index should meet the hardness number of drawing requirement。

Claims

A kind of sealing surface weld deposit technique, it is characterised in that comprise the steps:

1), operating procedure:

1.1), the integrity of butt welding machine is answered to check before welding；

1.2) preparation of workpiece, is welded:

1.2.1), must carrying out the workpiece of built-up welding first by groove face processing machine surfacing part, its size has to comply with drawing requirement；?

1.2.2), with the compression clean welding position of air blow drying and inner chamber before welding；?

1.2.3), to inside nominal diameter more than 150, apply oxy arc before the nominal pressure valve body built-up welding more than 2.5MPa and preheat around sealing surface；

1.2.4) workpiece, to built-up welding STL alloy, can carry out built-up welding after all preheating with oxy arc, and its preheating temperature is 300-600oC；

2), after welding treatment:

2.1), the workpiece that welds must be positioned in dry ground or dry husky (dry lime) groove, never accurate be positioned over wet ground or the place having water to splash；?

2.2), for small workpiece (flap, flashboard), apply dry sand and bury, allow its Slow cooling, make workpiece be in normalized condition；

3), inspection；
2, a kind of sealing surface weld deposit technique as claimed in claim 1, it is characterised in that also include

4), environmental requirement:

4.1), welding should carry out in indoor, and welding place should wind sheltering；

4.2), place be not allow for water stain, more not in the place welding having hydrops；

4.3), relative humidity more than 90%, when ambient temperature is lower than 5oC, do not allow welding；
3, a kind of sealing surface weld deposit technique as claimed in claim 1, it is characterised in that also include

5), built-up welding requires:

5.1), built-up welding time, adopt level welding, arc manipulation speed is uniform, must not teeter, adopt short arc welding；?

5.2) after, being soldered one layer, it is necessary to thoroughly remove slag and can carry out second layer welding；?

5.3), for the built-up welding (width is more than 30mm) of wide sealing surface, should the built-up welding layer by layer from both sides, centre is finally filled up, to reduce welding stress。