Method of butt locking of different-thickness parts

FIELD: process engineering.

SUBSTANCE: invention relates to welding, particularly, to electron beam welding vacuum of different-thickness parts. Said butt locking joint is made between large-depth part, lock base being made at weld edge end, and smaller-depth part to be jointed thereto. Note here that lock base is skewed at 45°≤α≤60°, while welding is effected with butt penetration through entire depth. Lock base can be skewed straightly or in zigzag manner.

EFFECT: higher quality of seam.

3 cl, 6 dwg

 

The METHOD of OBTAINING JOINT locks

RAZNOFORMNYH DETAILS

The invention relates to the field of welding, in particular by electron beam welding in vacuum raznoformnyh parts that contain massive element and costacabana with him the detail of smaller thickness (e.g., the cover), and can find application in various industries.

Known design corner unilateral welded joint bevel with complete penetration (Electron-beam welding. Welded joints. The main types, structural elements and dimensions. OST 26-260.453-92, UZ), used in electron beam welding raznoformnyh details. Using this design ensures full penetration throughout the entire thickness of the welded joint parts, as well as the lack of technological incomplete fusion.

However, a significant drawback of this design is, first, a sharp increase grata, when drops of excess molten metal under pressure are displaced from the weld zone. Because of the design features of a welded joint to eliminate such defect is not possible. Secondly, the appearance of weakening of the joint, which reduces the strength of the welded connection. Thirdly, the lack of support for the cover, and therefore there is a need to use additional e the fastening elements to hold the cover, which significantly complicates the welding process.

The closest in technical essence is butt-sided lock connection, which finds application in electron beam welding raznoformnyh parts (OST 26-260.453-92, C5). This design ensures the absence of burrs, moreover, the base of the castle, made at the end of the welded edges of the solid element is a pillar for cover and accurately align the welded elements.

The disadvantage of this design is the presence of technological incomplete fusion between the lid and the base of the castle. Technological weld creates a stress concentration, causing a decrease in endurance and strength of welded joints, and can cause crevice corrosion in the weld root.

An object of the invention is the provision of a full penetration weld on the entire thickness of the welded joint without technological incomplete fusion, reduction grata in the weld root and the exception occurrence of weakening in the top seam.

The technical result consists in increasing the quality of the welded connection.

The solution of the technical problem is achieved by the fact that in the famous butt interlock raznoformnyh parts, containing a massive element on the end of the welded edges of the base of the castle, and Saltykov is nnow with him the part of a lesser thickness, compared with the prototype of the base of the castle is made with straight bevel angle α, is chosen from the range of 45°≤α≤60°.

In addition, the bevel at the base of the castle can be made straight.

Additionally, the bevel at the base of the castle can be executed broken with the formation of the strip, the width of which is less than 0.3 widthtothe seam at the root.

The invention is illustrated by drawings, where figure 1 shows the cross-sectional shape of the prepared edges of the design of the proposed joint locking connection when the bevel lock bottoms at an angle α; figure 2 is a cross-sectional shape is made of a welded seam for the above construction; figure 3 is a cross-sectional shape of the prepared edges of the butt design tool joints with a broken bevel the base of the castle; figure 4 is a cross-sectional shape is made of a welded seam for the above design. Figure 5 presents macrosection of welding; figure 6 is a view from the side of the root pass welded joints made with the application of the proposed form cutting edges.

Butt locking compound contains a massive element 1, at the end of the welded edges of the base of the castle 2, costacabana with him part 3 (cover) thickness δ and the weld seam 4.

Welding using the bevel base C is µa 2 (figure 1 and figure 2) allows you to position the cover without the use of special technological equipment for its mounting, at the same time achieving high quality of the weld due to the lack of technology lack of fusion, to decrease the amount of attenuation on the surface of the weld and reduce the number grata in comparison with welding without the use of bevel base of the castle 2 on the end of the welded edges massive element 1. When welding with partial (broken) bevel the base of the castle 2 (figure 3 and figure 4) the length of the strip 5 is less than 0.3 widthtothe seam at the root. In addition to the lack of technological incomplete fusion is achieved the minimum number of burrs or its complete absence.

In the course of research conducted at the Department of Technology of metals of FGBOU VPO "NRU "MPEI", spent welding raznoformnyh welded joints with thick cover of δ=8 mm and 5 mm with various types of cutting edges: lock connection on C5 OST 26-260.453-92, UZ on OST 26-260.453-92, and when the bevel lock bottoms angles 30°, 45° and 60°. Material details : steel AISI 316 L (N). Welding was carried out by electron-beam installation ELA 60/60. The welding speed is 100 m/h, accelerating voltage of 60 kV. The beam current is 100 mA and 75 mA for welding thicknesses of 8 mm and 5 mm, respectively. According to the results of experiments, it was found that the most suitable welding is when the bevel lock bottoms at an angle α, is chosen from the range of 45°≤α≤60°. Decrease the angle can lead to the emergence of technology is provera due to incomplete fusion between the base of the lock and cover. The choice of these angles is also due to the possibility of using the standard milling cutters that do not require pereuchivaniya and allowing the cutting edges in one pass, which significantly simplifies and speeds up this operation. When performing broken bevel lock bottoms length strip width is less than 0.3 VK seam at the root; the width of the weld at the root depends on the welding conditions and is determined experimentally. Increasing the length of the shelves may lead to technological incomplete fusion.

The use of the invention can improve weld quality by ensuring full penetration throughout the entire thickness of the welded joint without technological incomplete fusion, while allowing you to minimize Burr.

1. The method of obtaining joint locks raznoformnyh parts, including cutting of the edges of parts for welding locking connection with the execution grounds of the castle at the end of the welded edges parts of greater thickness, joining with her items with less thickness and welding by electron-beam system, characterized in that the base of the castle comply with the bevel angle of 45°≤α≤60° , and the welding is performed with the penetration of the joint throughout the entire thickness.

2. The method according to claim 1, characterized in that the bevel at the base of the castle perform ramalina the output.

3. The method according to claim 1, characterized in that the bevel at the base of the castle, perform broken with the formation of the strip, of a width of less than 0.3 of the joint width at the root.



 

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