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

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

 

The invention relates to the field corps shipbuilding and can be used for welding parts of greater thickness.

There is a method of electron-beam welding of titanium alloys large thickness (see Martynov V.N., Hohlovsky A.S., Plum A.P. "Electron-beam welding of steels, aluminum and titanium alloys are of great thickness". - Welding production, 2009, No. 12, s - 25) is the closest equivalent.

When forming a joint on one of the parts form the lining of the allowance to be removed during machining after welding seam, which is carried out at a vertical position of the beam.

In this method, when forming the joint parts of great thickness, connected by electron beam welding, negotiated the gap between the ends of the parts in the junction (up to 0.3 mm), but are not regulated the size of the lining of a welded joint, which is guaranteed to provide output defective root of the site welded connections outside of the seam.

Therefore, the choice of the optimal size of the lining is the most critical factor in determining the quality of the welded connection.

The application of the lining of greater or lesser thickness and width leads either to excessive consumption of metal workpieces, or to increase the probability of formation of root defects of the welded connection, which entails additional the basic cost of fixing them.

The technical object of the present invention is the reduction of defects in welded joints of parts of large thicknesses of titanium alloys by electron-beam welding.

The technical result is achieved in that in the method of forming the joint parts greater thickness of the titanium alloys, joined the electron-beam welding, which consists in the formation of an allowance of one of the components removed during machining after welding the joint in the vertical position of the beam lining, thickness and width of the lining perform equal respectively to 0.25-0.35 and 0.10-0.15 of the thickness of the junction, with the back side of the lining opposite the junction of the perform risk-depth 0,004-0,006 on the thickness of the junction, which visually assess the absence of incomplete fusion at the output of the fusion.

Optimal parameters of the strip and depth of the risks identified empirically as a result of numerous experiments, in which these parameters are varied.

Suggested values for the parameters allow for the formation of a defect-free weld.

Figure 1 shows the design of the welded joint details.

Figure 2 shows the balloon And 1.

The method is as follows.

Parts 1 and 2 with prepared edges 3 collect on the mitts of the lining 4 manual argon-arc welding.

The gasket 4 on asout on one of the parts (from allowance).

The thickness and the width of the strip 4 perform equal respectively to 0.25-0.35 and 0.10-0.15 of the thickness of the junction of δ.

On the welded edges perform the cutting, allowing you to configure the junction remotely on the monitor.

On the reverse side of the lining 4 perform risk 5 along the axis of the junction depth 0,004-0,006 on the thickness of the interface δ, which allows you to visually evaluate the output of fusion lack of lack of fusion defects.

Welding is carried out in an electron-beam installation at vertical position of the beam for three passes, with the configuration of the beam to the joint exercise remotely monitor the cutting edges 3.

The first passage - forming, and the second degassing, the third smoothing performed defocused beam.

After welding, assess visually the absence of incomplete fusion at the output of the fusion at risk 5.

Then spend machining, removing the lining and the outer reinforcement for conducting quality control of welded seams.

The proposed technology provides high-quality welded joint.

The method of forming junction of the connected details of the big thickness of titanium alloys by electron-beam welding, including the formation of an allowance of one of the components removed during machining after welding the joint in the vertical position of the beam lining, ex is different, however, what thickness and width of the lining perform equal respectively to 0.25-0.35 and 0.10-0.15 of the thickness of the junction, with the back side of the lining opposite the junction of the perform risk-depth 0,004-0,006 on the thickness of the junction, which visually assess the absence of incomplete fusion at the output of the fusion.



 

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