CN115771029A - Monel alloy rotor support welding method - Google Patents
Monel alloy rotor support welding method Download PDFInfo
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- CN115771029A CN115771029A CN202310014350.2A CN202310014350A CN115771029A CN 115771029 A CN115771029 A CN 115771029A CN 202310014350 A CN202310014350 A CN 202310014350A CN 115771029 A CN115771029 A CN 115771029A
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Abstract
The invention discloses a Monel alloy rotor bracket welding method, which comprises the steps of digging a circular arc-shaped groove surface on a supporting square plate to be welded, ensuring the axial and radial dimensions of the welding of the supporting square plate and a main shaft through a positioning tool, welding a first supporting square plate by using a groove of the groove surface welded by argon arc, polishing the back surface, continuously welding after polishing the front surface, introducing argon gas for protection in the whole process, stabilizing a welding line, welding a surface by using carbon dioxide protection welding, then welding the next supporting square plate, and finally performing dye penetrant inspection and ultrasonic flaw detection inspection. The welding method is suitable for welding the rotor support made of the low-magnetism Monel alloy material, can avoid or reduce deformation and fracture caused by welding, avoids the reduction of the overall structural strength caused by incomplete penetration, and ensures the accurate size of the welded rotor support.
Description
Technical Field
The invention belongs to the technical field of material welding, and relates to a method for welding a Monel alloy rotor bracket.
Background
At present, a plurality of motors adopt Monel alloy materials as a rotor support due to the requirements of low-magnetic design and the like, and a main shaft of the rotor support and a supporting square plate of the rotor support are mostly in a welding form. The welding of the Monel alloy material is different from that of steel, and if the welding process is not operated properly, the composition of the Monel alloy material can be changed, so that the performance is changed, and internal defects, breakage and other damages are caused. Holes, seams and the like appear when incomplete penetration occurs in welding, the structural strength is reduced, the safety and the reliability of the motor are seriously affected, and huge loss is caused.
When the rotor support is welded by using the Monel alloy material, a reasonable welding method and steps are adopted, and through a series of welding processes and method measures, the structural strength can be ensured after welding while the material composition is not changed in the welding process, and a product with reliable quality is welded.
Disclosure of Invention
The invention aims to provide a Monel alloy rotor support welding method, which avoids the defects of holes and seams in a Monel alloy welding area, avoids fracture caused by welding, reduces welding deformation and ensures that a Monel alloy welding structure is safe and reliable by means of groove design, tool design, grinding process, welding time control, post-welding inspection and other measures.
The technical scheme adopted by the invention for solving the technical problems is as follows: a Monel rotor support welding method is used for welding a Monel rotor support consisting of a main shaft, a plurality of arc plates and supporting square plates, and comprises the following steps:
s1, digging an arc-shaped groove surface on a groove at one side of a supporting square plate close to a main shaft to ensure that welding can be completely welded, avoiding the defects of holes, seams and the like, and simultaneously reserving enough base metal to ensure the structural strength of a Monel alloy material;
s2, selecting two semicircular split tool plates with positioning grooves, connecting plates at two ends of the semicircular split tool plates into a positioning tool through bolts, placing a supporting square plate to be welded into the positioning grooves, inserting a main shaft into a circular cavity between the two split tool plates, ensuring that the supporting square plates are uniformly distributed along the position of the main shaft, and tightly attaching an arc plate to the surface of the split tool plate, so that the arc plate and the supporting square plate are fixed on the main shaft through the positioning tool, the distance d =2mm between a groove of the supporting square plate and a main shaft surface, and ensuring the axial and radial sizes of the welding of the supporting square plate and the main shaft through the positioning tool;
s3, welding a first supporting square plate by using the groove of the groove surface in argon arc welding in a first welding process, and polishing the reverse side of the groove surface to ensure that the welding material is completely combined with the supporting square plate and the main shaft material and is completely welded;
s4, polishing the front surface of the second welding channel, continuing to use a welding wire with the same components as the base metal to perform argon arc welding on the supporting square plate, introducing argon gas for protection in the whole process, avoiding impurities and air holes to be generated, so as to ensure that no impurities exist in the welding process, and after the argon arc welding is performed on the front surface and the back surface of the groove surface in an alternating mode until a stable welding seam is formed, using carbon dioxide to protect the welding surface, so that the welding seam is full and the strength of a welding body is enhanced;
s5, after the first supporting square plate is welded, a temperature measuring gun is used for measuring the temperature of a main shaft welding area, after 30 minutes, or the temperature of a main material is reduced to 50 ℃, and then the second supporting square plate is welded; the welding time of the two supporting square plates needs to be strictly controlled, so that the condition that the welding heat accumulation of the previous supporting square plate reaches the material composition change temperature of the main shaft to change the material composition of the main shaft to cause the material performance change is avoided; meanwhile, natural cooling is carried out for a certain time, so that the material can be prevented from being greatly deformed or broken due to excessive thermal stress;
and S6, after the last supporting square plate is welded, whether defective holes and seams exist in the welded body quality of the supporting square plate and the main shaft is checked through dye penetrant inspection, whether the main shaft is damaged internally due to high welding temperature is checked through ultrasonic flaw detection, and therefore the welded structure meets the requirements of safety and reliability.
The Monel rotor bracket welding method is characterized in that the section of the groove surface is in a 1/4 arc type, the groove surface is tangent to the central line of the supporting square plate, and the radius of the groove surface is 1/2 of the thickness of the supporting square plate.
According to the welding method of the Monel rotor support, the axial height of the split tooling plate is 50mm, and the radial thickness of the split tooling plate is 50mm; the axial groove depth of the positioning groove is 40mm.
According to the method for welding the Monel alloy rotor support, semicircular holes are formed in two ends of a supporting square plate to release welding stress.
The invention has the beneficial effects that:
the welding method of the invention enables the welding to reach the expected structural strength through the process measures of groove design, tool design, grinding process, welding time control, post-welding inspection and the like; the method has the advantages that the change of material components during Monel alloy welding is avoided, the defects of holes and seams in a welding area are avoided, the fracture caused by welding is avoided, and the welding deformation is reduced; the welded Monel alloy structure is safe and reliable.
The welding method can be used for the Monel metal rotor bracket structure formed by welding the support plate and the shaft in various forms and sizes. The positioning tool can be repeatedly used for batch welding. The components and the performance of the welded Monel structural body material are unchanged, the structural strength is good, and the welding method is safe and reliable.
The invention adopts the carbon dioxide protection welding to manufacture the surface, and adopts the process control process, the welding seam grinding process, the welding time control process, the welding quality detection method, the welding seam surface inspection and the internal material inspection to ensure the welding quality and the stability of the internal material of the main shaft.
Drawings
FIG. 1 is a schematic view of a Monel rotor spider according to the present invention;
FIG. 2 is an enlarged view of a portion A of FIG. 1;
FIG. 3 is a schematic structural view of the positioning tool of the present invention;
fig. 4 is a schematic view of the overall welding structure of the present invention.
The figures are numbered: 11-main shaft, 12-arc plate, 13-supporting square plate, 14-groove surface, 21-split tooling plate, 22-positioning groove, 23-connecting plate.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention discloses a Monel rotor support welding method which is suitable for welding a Monel rotor support structure consisting of arc plates 12, supporting square plates 13 and a main shaft 11 in various forms and sizes, wherein the Monel rotor support structure is shown in figure 1. The welding method mainly comprises the following process measures of groove design, tool design, grinding process, welding time control, post-welding inspection and the like, and comprises the following steps:
s1, digging an arc-shaped groove surface 14 on a groove at one side of a supporting square plate 13 close to a main shaft 11 to ensure that welding can be completely welded, avoiding the defects of holes, seams and the like, and simultaneously reserving enough base metal to ensure the structural strength of the Monel alloy material. As shown in FIG. 2, the section of the groove surface 14 is in a 1/4 arc shape, the groove surface is tangent to the central line of the supporting square plate 13, the radius is 1/2 of the thickness of the supporting square plate 13, the other half of the groove surface keeps the original groove shape, and meanwhile, enough parent metal can be reserved to guarantee the structural strength of the Monel alloy material.
S2, selecting two semicircular split tooling plates 21 with positioning grooves 22, and connecting plates 23 at two ends of the two semicircular split tooling plates into a positioning tool through bolts, wherein as shown in FIG. 3, the inner diameter of the positioning tool is the same as that of the main shaft 11, the axial height of the split tooling plates 21 is 50mm, and the radial thickness of the split tooling plates is 50mm; the width of the groove of the positioning groove 22 is the same as that of the supporting square plate 13, the depth of the axial groove is 40mm, enough constraint force can be guaranteed through bolt connection, the supporting square plate 13 to be welded can be repeatedly used, the supporting square plate 13 to be welded is placed into the positioning groove 22, the main shaft 11 is inserted into a circular cavity between the two split tooling plates 21, the supporting square plate 13 is guaranteed to be uniformly distributed along the position of the main shaft 11, deformation caused by welding is reduced, the arc plate 12 is tightly attached to the surface of the split tooling plate 21, the arc plate 12 and the supporting square plate 13 are fixed onto the main shaft 11 through a positioning tool, the distance d =2mm between the groove of the supporting square plate 13 and the surface of the main shaft 11, and the axial size and the radial size of the welding of the supporting square plate 13 and the main shaft 11 are guaranteed through special positioning tool design.
In the step, the axial and radial dimensions are positioned by designing a positioning tool, welding is carried out by adopting an asymmetric groove design on the basis of a groove which is subjected to normal butt welding, and the specially designed groove surface 14 ensures that the base metal and a welding area are well combined.
And S3, welding the first supporting square plate 13 by using a groove formed in the groove surface 14 in the argon arc welding process in the first welding process, polishing the reverse side of the first supporting square plate to ensure that the welding material is completely combined with the materials of the supporting square plate 13 and the main shaft 11 and is completely welded, and ensuring that the base material is completely welded by using a reverse side polishing method in the first welding line of argon arc welding bottoming to ensure that the welding material is completely combined with the materials of the supporting square plate 13 and the main shaft 11 and prevent seams and holes from appearing in a welded body.
Two ends of the supporting square plate 13 in the step are provided with semicircular holes for releasing welding stress; the supporting square plate 13 is clamped in the positioning groove 22, and the axial positioning, the circumferential angle positioning and the radial clearance positioning of the supporting square plate 13 and the main shaft 11 are determined according to the notch position, so that the welding position precision of the supporting square plate 13 is ensured; the supporting square plates 13 are welded at intervals in spatial positions so as to avoid heat from being concentrated on a certain area of the main shaft 11.
And S4, polishing the front surface of the second welding channel, continuing to use a welding wire with the same components as the base metal to perform argon arc welding to weld the supporting square plate 13, introducing argon gas for protection in the whole process, avoiding impurities and air holes to ensure that no impurities exist in the welding process, after completing argon arc welding bottoming of two surfaces, alternately welding the front surface and the back surface of the groove surface 14 by argon arc welding until a stable welding seam is formed, and using carbon dioxide to protect welding surface to make the welding seam full and strengthen the strength of the welding body.
S5, after the first supporting square plate 13 is welded, a temperature measuring gun is used for measuring the temperature of the welding area of the main shaft 11, after 30 minutes, or the temperature of the main material is reduced to 50 ℃, and then the second supporting square plate 13 is welded; the welding time of the two supporting square plates 13 is also strictly controlled, so that the condition that the welding heat accumulation of the previous supporting square plate 13 reaches the material composition change temperature of the main shaft 11, and the material performance of the main shaft 11 is changed due to the change of the material composition is avoided; meanwhile, the material is naturally cooled for a certain time, so that the material can be prevented from being greatly deformed or broken due to excessive thermal stress.
S6, as shown in figure 4, after the last supporting square plate 13 is welded, whether defective holes and seams exist in the quality of a welded body of the supporting square plate 13 and the main shaft 11 is checked through dye penetrant inspection, and whether the main shaft 11 is internally damaged due to high welding temperature is checked through ultrasonic flaw detection, so that the welded structure can meet the requirements of safety and reliability.
The above-described embodiments are merely illustrative of the principles and effects of the present invention, and some embodiments may be applied, and it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the inventive concept of the present invention, and these embodiments are within the scope of the present invention.
Claims (4)
1. A Monel rotor support welding method is used for welding a Monel rotor support composed of a main shaft (11), a plurality of arc plates (12) and supporting square plates (13), and is characterized in that: comprises the following steps
S1, digging a circular arc-shaped groove surface (14) on a groove at one side of a supporting square plate (13) close to a main shaft (11);
s2, selecting two semicircular split tooling plates (21) with positioning grooves (22), connecting plates (23) at two ends of each semicircular split tooling plate into positioning tooling through bolts, placing a supporting square plate (13) into the positioning grooves (22), inserting a main shaft (11) into a cavity between the two split tooling plates (21), ensuring that the supporting square plates (13) are uniformly distributed along the position of the main shaft (11), tightly attaching an arc plate (12) to the surfaces of the split tooling plates (21), and enabling the distance d =2mm between the divided edge of the supporting square plate (13) and the main shaft (11);
s3, welding the first supporting square plate (13) by using the groove of the groove surface (14) through argon arc welding, and polishing the reverse surface of the groove surface to ensure that the welding material is completely combined and welded through with the supporting square plate (13) and the main shaft (11);
s4, polishing the front side of the groove, continuously welding the supporting square plate (13) by using argon arc welding, introducing argon gas for protection in the whole process, alternately welding the front side and the back side of the groove surface (14) by argon arc welding until a stable welding seam is formed, and then welding a surface by using carbon dioxide protection welding to make the welding seam full;
s5, after the first supporting square plate (13) is welded, measuring the temperature of a welding area by using a temperature measuring gun, and after 30 minutes or when the temperature is reduced to 50 ℃, welding the next supporting square plate (13);
s6, after the last supporting square plate (13) is welded, whether defective holes and seams exist in the quality of a welded body of the supporting square plate (13) and the main shaft (11) is checked through dye penetrant inspection, and whether the main shaft (11) is internally damaged due to high welding temperature is checked through ultrasonic flaw detection.
2. The method for welding a monel rotor spider according to claim 1, wherein the cross section of the groove surface (14) is a 1/4 circular arc, tangent to the center line of the supporting square plate (13), and has a radius of 1/2 of the thickness of the supporting square plate (13).
3. The method for welding a monel rotor spider as recited in claim 2, wherein said split tooling plate (21) has an axial height of 50mm and a radial thickness of 50mm; the axial groove depth of the positioning groove (22) is 40mm.
4. The method for welding a monel rotor spider as recited in claim 2, wherein said supporting square plates (13) are provided with semicircular holes at both ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310014350.2A CN115771029A (en) | 2023-01-05 | 2023-01-05 | Monel alloy rotor support welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310014350.2A CN115771029A (en) | 2023-01-05 | 2023-01-05 | Monel alloy rotor support welding method |
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| Publication Number | Publication Date |
|---|---|
| CN115771029A true CN115771029A (en) | 2023-03-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310014350.2A Pending CN115771029A (en) | 2023-01-05 | 2023-01-05 | Monel alloy rotor support welding method |
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| CN (1) | CN115771029A (en) |
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- 2023-01-05 CN CN202310014350.2A patent/CN115771029A/en active Pending
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