RU2527566C1 - Forming of butt between large-depth parts from titanium alloys to be jointed by electron-beam welding - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: proposed method comprises making of backing of allowance of one of the parts. Said backing is removed at machining after butt welding at vertical position of the beam. Backing depth and width equal 0.25-0.35 and 0.10-0.15 of butt depth, accordingly. Mark 0.004-0.006 of butt depth is made on back of backing opposite the butt to evaluate visually the absence of bridging by smelting rate.

EFFECT: high-quality weld.

2 dwg

Description

The invention relates to the field of hull shipbuilding and can be applied when joining by welding parts of large thickness.

A known method of electron beam welding of titanium alloys of large thickness (see Martynov V.N., Khokhlovsky A.S., Sliva A.P. "Electron beam welding of steels, aluminum and titanium alloys of large thickness." - Welding, 2009 , No. 12, p.22 - 25) - the closest analogue.

When forming a joint on one of the parts, a lining is formed from the allowance, which is removed during machining after welding the joint, which is carried out in the vertical position of the beam.

In this method, when forming the joint of large-thickness parts joined by electron beam welding, the gap between the ends of the parts in the joint (up to 0.3 mm) is stipulated, but the dimensions of the lining of the welded joint are not regulated, which guarantee that the defective root section of the welded joint is output beyond seam limits.

Therefore, the choice of the optimal lining dimensions is the most critical point determining the quality of the welded joint.

The use of a lining of a greater or lesser thickness and width leads either to excessive consumption of the workpiece metal, or to an increase in the likelihood of the formation of root defects of the welded joint, which entails additional costs for their correction.

The technical task of the invention is to reduce the defectiveness of welded joints of parts of large thicknesses from titanium alloys in electron beam welding.

The technical result is achieved by the fact that in the method of forming the junction of large thickness parts from titanium alloys joined by electron beam welding, which consists in forming from the allowance of one of the parts removed during machining after welding the joint at the vertical position of the lining beam, the thickness and width of the lining are equal 0.25-0.35 and 0.10-0.15 of the joint thickness, respectively, while on the back side of the linings opposite the joint, a risk of a depth of 0.004-0.006 of the joint thickness is used to visually evaluate lack of lack of penetration.

The optimal laying parameters and the depth of the risks were determined empirically as a result of numerous experiments in which these parameters varied.

The proposed parameter values make it possible to ensure defect-free formation of the weld.

Figure 1 shows the design of the joint of the welded parts.

Figure 2 shows the leader A of figure 1.

The method is as follows.

Parts 1 and 2 with prepared edges 3 are assembled on tacks from the side of the lining 4 by manual argon arc welding.

The gasket 4 is formed on one of the parts (from its allowance).

The thickness and width of the strip 4 is equal to 0.25-0.35 and 0.10-0.15 of the joint thickness δ, respectively.

Cutting is performed on the welded edges, which allows you to perform joint adjustment remotely on the monitor.

On the reverse side of the lining 4, risk 5 is performed along the joint axis with a depth of 0.004-0.006 of the joint thickness δ, which allows you to visually evaluate the absence of lack of penetration by the penetration.

Welding is carried out in an electron beam installation with a vertical position of the beam in three passes, while adjusting the beam to the joint is carried out remotely on the monitor for cutting edges 3.

The first passage is forming, the second is degassing, the third is smoothing, performed by a defocused beam.

At the end of welding, visually assess the absence of lack of penetration by the yield of melt at risk 5.

After that, machining is carried out, removing the lining and external reinforcement for quality control of welds.

The proposed technology provides high-quality welded joints.

Claims (1)

A method of forming a junction of joined parts of large thickness from titanium alloys during electron beam welding, comprising forming from the stock one of the parts removed during machining after welding the joint at the vertical position of the lining beam, characterized in that the thickness and width of the lining are 0.25, respectively -0.35 and 0.10-0.15 of the thickness of the joint, while on the back side of the linings opposite the joint, they take a risk of a depth of 0.004-0.006 of the thickness of the joint, according to which the absence of lack of penetration is visually assessed melted the row.

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