Process evaluation device and process evaluation method for cast steel and cast steel butt welding

Abstract

The invention discloses a cast steel and cast steel butt welding process evaluation device and process evaluation method.The cast steel and cast steel butt welding process evaluation device comprises a structural part protection part, a heat preservation cotton plate and a horizontal placement part, protection cotton is arranged in the structural part protection part, and the horizontal placement part is arranged on the structural part protection part; the two welding materials are horizontally placed on the upper portion of the structural part protection part through the horizontal placing part, a welding groove is formed between the two welding materials, the heat preservation cotton plate is correspondingly arranged under the welding groove, and the structural part protection part is provided with a shielding gas assembly corresponding to the welding groove. The structure protection part of the box body structure is arranged, the two cast steel plates are horizontally arranged on the structure protection part through the horizontal placement part, heat preservation or shielding gas protection on the welding position is achieved through the heat preservation cotton plate and the shielding gas assembly based on the welding process to be evaluated, and therefore process evaluation is facilitated; by means of the process evaluation method, the operation cost of follow-up actual welding can be greatly reduced, and guarantee is provided for engineering construction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding process evaluation, in particular to a cast steel and cast steel butt welding process evaluation device and method. BACKGROUND

[0002] In the welding professional block, large structural parts, oil pipelines and pressure equipment, etc. often need to be manufactured by welding, especially in the design of large spare parts for special equipment, there are many welding operations in the same device with the same metal connection, different metal connection, etc. such as: base metal cast steel ZG35Cr24Ni7SiN + cast steel ZG35Cr24Ni7SiN same material welding; base metal cast steel ZG35Cr24Ni7SiN + stainless steel 06Cr25Ni20 dissimilar material welding; base metal cast steel ZG35Cr24Ni7SiN + low alloy steel Q355 dissimilar material welding; base metal stainless steel 06Cr25Ni20 + low alloy steel Q355 dissimilar material welding; base metal low carbon steel Q235 + low alloy steel Q355 dissimilar material welding, etc.

[0003] When welding different kinds of cast steel, a large number of welding equipment and welding materials need to be purchased to meet the welding requirements of different metal connections, which occupies a large area, has complex process and high cost. Direct welding is also prone to welding defects, and the welding quality cannot be guaranteed.

[0004] In view of the above defects, the present application creator has finally obtained the present application after a long time of research and practice. SUMMARY

[0005] To solve the above technical defects, the technical scheme adopted by the present application is to provide a cast steel and cast steel butt welding process evaluation device, which comprises a structural part protection part, a heat preservation cotton board and a horizontal placement part. The structural part protection part is provided as an open-ended rectangular box structure, the protection cotton is arranged in the structural part protection part, the horizontal placement part is arranged on the structural part protection part, two welding materials are horizontally placed on the upper part of the structural part protection part through the horizontal placement part, a welding groove is formed between the two welding materials, the heat preservation cotton board is correspondingly arranged below the welding groove, and the structural part protection part is provided with a protection gas assembly corresponding to the welding groove. The two welding materials are both cast steel plates.

[0006] Preferably, the protection gas assembly comprises a protection gas inlet hole and a protection gas conveying pipeline, the protection gas inlet hole is arranged on the structural part protection part, the protection gas inlet hole is arranged below the welding groove, and the protection gas inlet hole is connected with the protection gas conveying pipeline.

[0007] Preferably, the structural member protection portion includes a base plate, two first side plates and two second side plates, the two first side plates are arranged in parallel, the two second side plates are arranged in parallel, and the first side plates and the second side plates are both vertically fixed on the base plate, and the first side plates and the second side plates are alternately arranged to form a rectangular frame structure.

[0008] Preferably, the height dimension of the first side plate is greater than the height dimension of the second side plate, and the two first side plates are simultaneously arranged on both sides of the two cast steel plates.

[0009] Preferably, the horizontal placement part includes two horizontal support plates, the two horizontal support plates are arranged on the same horizontal plane, and the two horizontal support plates are respectively fixed on the two second side plates, the horizontal support plates are correspondingly arranged at the upper ends of the second side plates, and the horizontal support plates on the two second side plates respectively support the two cast steel plates.

[0010] Preferably, the two cast steel plates are both configured as flat plates, and a single-sided bevel is provided on one side of the two cast steel plates, and the single-sided bevel of the two cast steel plates forms the welding groove.

[0011] Preferably, the single-sided bevel is set to a 30° inclined bevel, the cross-section of the welding groove is a Y-shaped groove as a whole, and the upper part of the welding groove is a V-shaped groove with a 60° angle formed by two single-sided bevels.

[0012] Preferably, a process evaluation method for butt welding of cast steel and cast steel, using the process evaluation device for butt welding of cast steel and cast steel, comprises the steps of:

[0013] S1, preparation before welding;

[0014] S2, welding process route;

[0015] In step S2, the welding process route is:

[0016] Install the structural member protection portion and insert the protective gas delivery pipe into the structural member protection portion to supply gas in advance; place the thermal insulation cotton board into the structural member protection portion; and place the two aligned cast steel plates horizontally on the horizontal placement portion;

[0017] The welding groove is cleaned, and the single-sided groove on both sides is preheated by 100° to 120°; the weld includes a bottom layer, a filling layer and a cover layer from bottom to top. ERNiCrMo-3 welding wire is used for welding the weld. The welding of the bottom layer adopts a straight wire feeding method, and the welding of the filling layer and the cover layer adopts a crescent wire feeding method. The interlayer temperature is maintained during the welding process, and local welding stress is eliminated by hammering and each layer is cleaned. After the cover layer is welded, the weld is track-tempered by 300°. After the weld cools to room temperature, X-ray flaw detection and mechanical property testing are performed, and finally it is delivered for use in the formulated welding process.

[0018] Compared with the prior art, the beneficial effect of the present invention is that: the present invention sets the structural protection part of the box structure, sets the two cast steel plates horizontally on the structural protection part through the horizontal placement part, and based on the welding process to be evaluated, the insulation cotton board and the protective gas component are used to achieve insulation or protective gas protection at the welding position, thereby facilitating process evaluation. The process evaluation of the present invention can greatly reduce the operating cost of subsequent actual welding, providing protection for engineering construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A structural stereoscopic view of the process evaluation device for butt welding of cast steel and cast steel;

[0020] Figure 2 An exploded view of the structure of the process evaluation device for butt welding of cast steel and cast steel;

[0021] Figure 3 Schematic diagram of the weld seam of the butt welding of cast steel and cast steel.

[0022] The numbers in the figure represent:

[0023] 1-first cast steel plate; 2-second cast steel plate; 3-weld; 4-single-side bevel; 5-structural component protection portion; 6-shielding gas inlet hole; 7-shielding gas delivery pipeline; 8-insulation cotton board; 9-horizontal placement portion; 31-bottom layer; 32-first filling layer; 33-second filling layer; 34-covering layer. DETAILED DESCRIPTION

[0024] The above and other technical features and advantages of the present invention are described in more detail below with reference to the accompanying drawings.

[0025] Example 1

[0026] like Figure 1 、 Figure 2 As shown, Figure 1 A structural stereoscopic view of the process evaluation device for butt welding of cast steel and cast steel; Figure 2 The exploded view of the structure of the process qualification device for butt welding of cast steel and cast steel.

[0027] The cast steel and cast steel butt welding process evaluation device comprises a structural part protection part 5, a heat preservation cotton plate 8 and a horizontal placement part 9, the structural part protection part 5 is provided as a long box structure with an open upper end, the protection cotton is arranged in the structural part protection part 5, the horizontal placement part is arranged on the structural part protection part 5, two welding materials are horizontally placed on the upper part of the structural part protection part 5 through the horizontal placement part, a welding groove is formed between the two welding materials, the heat preservation cotton plate 8 is correspondingly arranged directly below the welding groove, the structural part protection part 5 is provided with a protective gas assembly corresponding to the welding groove, and the two welding materials are both cast steel plates, which are a first cast steel plate 1 and a second cast steel plate 2 respectively.

[0028] Preferably, the protective gas assembly comprises a protective gas inlet hole 6 and a protective gas conveying pipeline 7, the protective gas inlet hole 6 is arranged on the structural part protection part 5, the protective gas inlet hole 6 is arranged below the welding groove, and the protective gas inlet hole 6 is connected with the protective gas conveying pipeline 7, so as to introduce welding protective gas into the structural part protection part 5, so as to protect the back of the weld 3 from forming at the welding groove.

[0029] Specifically, the structural part protection part 5 comprises a bottom plate, two first side plates and two second side plates, the two first side plates are arranged in parallel, the two second side plates are arranged in parallel, and the first side plates and the second side plates are both fixed vertically on the bottom plate, and the first side plates and the second side plates alternately surround to form a rectangular frame structure, so that the structural part protection part 5 forms a sealed structure with only the upper end being open, so that the protective cotton can be used to heat the welding position while the protective gas can be used to protect the welding position.

[0030] Preferably, the height dimension of the first side plate is greater than that of the second side plate, and the two first side plates are arranged on the two sides of the two cast steel plates at the same time, so that the two cast steel plates can be limited in the horizontal direction, so as to further improve the position stability of the two cast steel plates after alignment.

[0031] The horizontal placement part 9 comprises two horizontal support plates, the two horizontal support plates are arranged on the same horizontal plane, and the two horizontal support plates are fixedly arranged on the two second side plates respectively, the horizontal support plates are correspondingly arranged at the upper ends of the second side plates, and the horizontal support plates on the two second side plates correspondingly support the two cast steel plates, so as to ensure the alignment stability of the two cast steel plates.

[0032] The two cast steel plates are both provided as flat plate parts, and one side of each of the two cast steel plates is provided with a single-bevel groove 4, and the single-bevel grooves 4 of the two cast steel plates form the welding groove.

[0033] The single-bevel groove 4 is generally set as a 30° inclined groove, and the cross section of the welding groove is a Y-shaped groove as a whole, and the upper part of the welding groove is formed as a V-shaped groove with an angle of 60° by the two single-bevel grooves 4.

[0034] The two cast steel plates are horizontally arranged on the structure protection part through the horizontal arrangement part, and the heat preservation cotton board 8 and the protection gas assembly are used to realize heat preservation or protection gas protection at the welding position based on the welding process to be evaluated, so that process evaluation is facilitated, the structure is novel, the configuration is compact and reasonable, investment is saved, the occupied site is small, the operation and maintenance cost is low, and the operation is reliable.

[0035] Example two

[0036] In this embodiment, the two welding materials are both cast steel (ZG35Cr24Ni7SiN).

[0037] The first cast steel plate 1 is machined from 25mm, with a size of 400mm*200mm*25mm, and a 30° single-bevel groove 4 is machined on the long side.

[0038] The second cast steel plate 2 is machined from 25mm, with a size of 400mm*200mm*25mm, and a 30° single-bevel groove 4 is machined on the long side.

[0039] The two cast steel plates and the two welding material groups form a Y-shaped welding groove, and then a weld 3 is formed by single-sided welding and double-sided forming.

[0040] The structure protection part 5 is machined and welded from 10mm, and the two cast steel plates are horizontally arranged on the horizontal arrangement part 9. The protection gas delivery pipeline 7 is machined from a seamless steel pipe φ10mm and is inserted into the protection gas inlet hole 6, and the delivered argon gas protects the weld 3 formed on the back of the two cast steel plates.

[0041] Connection mode: first, the single-bevel groove 4 is formed on the two cast steel plates by machining, then the two cast steel plates are paired, the protection gas delivery pipeline 7 is inserted into the protection gas inlet hole 6, the heat preservation cotton board 8 is placed in the structure protection part 5, the two cast steel plates are horizontally arranged on the horizontal arrangement part, and finally the two cast steel plates are welded to form a weld 3.

[0042] Example three

[0043] The process evaluation method for cast steel and cast steel butt welding of the application comprises the following steps:

[0044] S1, welding preparation;

[0045] S2, welding process route.

[0046] In step S2, the welding process route is:

[0047] Install the structural member protection portion 5 and insert the protective gas delivery pipe 7 into the structural member protection portion 5 and supply gas 2 minutes in advance to fill the structural member protection portion 5 with argon gas for bottom layer welding protection; place the thermal insulation board 8 into the structural member protection portion 5; finally, place the two aligned cast steel plates horizontally on the horizontal placement portion 9;

[0048] The welding groove is cleaned, and the single-sided groove 4 on both sides is preheated by 100° to 120°. The weld 3 includes a bottom layer 31, a filling layer and a cover layer 34 from bottom to top. ERNiCrMo-3 welding wire is used when welding the weld 3. The welding of the bottom layer 31 adopts a straight wire feeding method, and the welding of the filling layer and the cover layer 34 adopts a crescent wire feeding method. During the welding process, the interlayer temperature is maintained, local welding stress is eliminated by hammering, and each layer is cleaned without welding defects. After the welding of the cover layer 34 is completed, the weld 3 is track-tempered by 300°. After the weld 3 cools to room temperature, X-ray flaw detection and mechanical property testing are performed, and finally it is delivered for use in the formulated welding process.

[0049] like Figure 3 As shown, Figure 3 Schematic diagram of the weld 3 of the butt welding of cast steel and cast steel; in this embodiment, the filling layer is provided with two layers, namely a first filling layer 32 and a second filling layer 33.

[0050] In step S2, different welding process parameters are adopted based on different welding processes to achieve process evaluation of the corresponding welding processes.

[0051] The specific contents of the pre-welding preparation in step S1 are as follows:

[0052] Welding equipment: Panasonic YC-400TX4 combined manual argon arc welding and stick arc welding machine, Panasonic YD-350FR2 manual CO2 gas shielded welding machine, high-purity argon (9999.9%). Welding consumables: ERNiCrMo-3 welding wire, 2.5mm φ for GTAW argon arc welding, 1.2mm φ for MAG gas shielded welding.

[0053] Bottom weld protection cooling device: the structural component protection portion 5 and the thermal insulation cotton board 8.

[0054] Auxiliary facilities: angle grinder, file, hammer, flat shovel, mask, sample, thermometer, magnifying glass, thermal insulation cotton.

[0055] Welding material: first cast steel plate 1 and second cast steel plate 2.

[0056] Pre-welding requirements: the welding position area and welding material should not have oil stains, oxidation layer, moisture, etc., and the metal luster should be exposed. Use oxyacetylene flame to remove moisture and oil, and then polish and remove rust with sandpaper or grinding machine.

[0057] Welding position: horizontal fixed welding 1G.

[0058] Welding requirements: single-sided welding double-sided forming weld 3, the welding layer is fused with the base material, the weld 3 has no welding defects and meets the design size.

[0059] In the present embodiment, the specific welding process parameters of the cast steel and the butt welding of the cast steel are selected by the following table.

[0060] Welding process parameter selection table

[0061]

[0062] The specific content of the step S2 is as follows:

[0063] Install the structure protection part 5, insert the protection gas delivery pipeline 7 and send gas 2 minutes in advance, so that the inside of the structure protection part 5 is filled with argon, which is convenient for the bottom layer 31 of the welding groove to be welded, the heat insulation cotton board 8 is placed in the structure protection part 5, and finally the two cast steel plates are placed horizontally on the horizontal placement part. The single-sided groove 4 is cleaned, and the single-sided groove 4 on both sides is preheated to 100-120 DEG. In order to better reduce the local temperature difference stress, improve the internal organization, prevent or reduce the hardening organization, the temperature verification must be carried out on both sides of the welding seam 3 by using a temperature gun, after the temperature reaches, the bottom layer 31 is welded by using a combination of a Panasonic YC-400TX4 manual argon arc welding and a stick arc welding, a manual tungsten argon arc welding straight line operation method, high-purity argon with a purity of 9999.9%, welding material: ERNiCrMo-3 welding wire, argon arc welding wire φ2.5mm. The horizontal angle between the welding wire and the welding part is 20-45 DEG, the horizontal angle between the welding gun and the welding part is 75-85 DEG, the welding current is 110A-140A, the welding seam 3 is divided into the bottom layer 31, the first filling layer 32, the first filling layer 32 and the cover layer 34 from bottom to top, after the single-sided welding of the bottom layer 31 is completed, the surface of the welding seam 3 is cleaned to ensure that there is no welding defect and the welding seam 3 is flat, which is convenient for the filling layer welding, the filling layer and the cover layer 34 are started to be welded by using a YD-350FR2 manual carbon dioxide gas protection welding machine, the gas protection welding wire is φ1.2mm, the welding material is ERNiCrMo-3 welding wire, the interlayer temperature is kept not lower than the preheating temperature, a crescent-shaped operation method is adopted, the surface of the welding seam 3 is cleaned layer by layer, the welding layer reaches 10mm and must be hammered to further eliminate the local welding stress, after ensuring that there is no welding defect, the next layer welding is carried out, the cover layer 34 must be higher than the base material, but cannot be >3mm, the two sides of the welding seam 3 keep smooth transition with the base material, after the whole welding is completed, the oxygen acetylene is used to continue to heat the welding seam 3 area to 300 DEG for 2 hours, then the heat insulation cotton is wrapped and slowly cooled to room temperature, the X-ray detection is carried out on the pressure vessel by nondestructive testing JB / T4730-2005, then the mechanical property detection is carried out according to NB / T47016-2011, the detection effect is confirmed, the cast steel and the cast steel welding performance completely meet the requirements, and the welding process is delivered for use.

[0064] The present application is aimed at the particularity of the butt welding of the cast steel ZG35Cr24Ni7SiN, a device and a process for evaluating the butt welding of the cast steel and the cast steel are developed and implemented, the implementation of the process evaluation method is not only safe and easy to operate, the welding quality is stable, the investment cost is low, the actual demand on the site is met, the work efficiency is high, and the maintenance cost is greatly reduced, which provides protection for engineering construction. Meanwhile, the process evaluation of the cast steel and the cast steel welding provides a scientific reference basis for other special type welding.

[0065] The above descriptions are only the preferable embodiments of the present application, which are only illustrative but not restrictive. It is understood by those skilled in the art that many changes, modifications, even equivalences can be made to the present application within the spirit and scope defined by the claims of the present application, and all of them will fall into the protection scope of the present application.

Claims

1. A process evaluation device for butt welding of cast steel and cast steel, characterized in that: It includes a structural part protection part, a thermal insulation cotton board and a horizontal placement part. The structural part protection part is configured as a rectangular box structure with an open upper end. The protective cotton is arranged in the structural part protection part. The horizontal placement part is arranged on the structural part protection part. Two welding materials are horizontally placed on the upper part of the structural part protection part through the horizontal placement part. A welding groove is formed between the two welding materials. The thermal insulation cotton board is correspondingly arranged directly below the welding groove. The structural part protection part is provided with a shielding gas assembly corresponding to the welding groove. Both welding materials are cast steel plates.

2. The process evaluation device for butt welding of cast steel and cast steel according to claim 1, characterized in that: The shielding gas assembly includes a shielding gas inlet hole and a shielding gas delivery pipeline. The shielding gas inlet hole is arranged on the structural component protection part, the shielding gas inlet hole is arranged corresponding to the bottom of the welding groove, and the shielding gas inlet hole is connected to the shielding gas delivery pipeline.

3. The process evaluation device for butt welding of cast steel and cast steel as claimed in claim 2, characterized in that: The structural member protection portion includes a bottom plate, two first side plates and two second side plates, the two first side plates are arranged in parallel, the two second side plates are arranged in parallel, and the first side plates and the second side plates are both vertically fixed on the bottom plate, and the first side plates and the second side plates are alternately arranged to form a rectangular frame structure.

4. The process evaluation device for butt welding of cast steel and cast steel as claimed in claim 3, characterized in that: The height dimension of the first side plate is greater than the height dimension of the second side plate, and the two first side plates are simultaneously arranged on both sides of the two cast steel plates.

5. The process evaluation device for butt welding of cast steel and cast steel as claimed in claim 3, characterized in that: The horizontal placement part includes two horizontal support plates, which are arranged on the same horizontal plane and are respectively fixed on the two second side plates. The horizontal support plates are correspondingly arranged on the upper ends of the second side plates, and the horizontal support plates on the two second side plates respectively support the two cast steel plates.

6. The process evaluation device for butt welding of cast steel and cast steel as claimed in claim 3, characterized in that: The two cast steel plates are both configured as flat plates, and one side of the two cast steel plates is provided with a single-sided bevel, and the single-sided bevel of the two cast steel plates forms the welding groove.

7. The process evaluation device for butt welding of cast steel and cast steel according to claim 6, characterized in that: The single-sided bevel is set to a 30° inclined bevel, the cross-section of the welding groove is a Y-shaped groove as a whole, and the upper part of the welding groove is a V-shaped groove with a 60° angle formed by two single-sided bevels.

8. A process evaluation method for butt welding of cast steel and cast steel, characterized in that: A process assessment device for butt welding of cast steel and cast steel as claimed in any one of claims 2 to 7, comprising the steps of: S1, preparation before welding; S2, welding process route; In step S2, the welding process route is: Install the structural member protection portion and insert the protective gas delivery pipe into the structural member protection portion to supply gas in advance; place the thermal insulation cotton board into the structural member protection portion; and place the two aligned cast steel plates horizontally on the horizontal placement portion; The welding groove is cleaned, and the single-sided groove on both sides is preheated by 100° to 120°; the weld includes a bottom layer, a filling layer and a cover layer from bottom to top. ERNiCrMo-3 welding wire is used for welding the weld. The welding of the bottom layer adopts a straight wire feeding method, and the welding of the filling layer and the cover layer adopts a crescent wire feeding method. The interlayer temperature is maintained during the welding process, and local welding stress is eliminated by hammering and each layer is cleaned. After the cover layer is welded, the weld is track-tempered by 300°. After the weld cools to room temperature, X-ray flaw detection and mechanical property testing are performed, and finally it is delivered for use in the formulated welding process.

Images