Positioning grid special-shaped spot-welding electrode

Abstract

The invention belongs to the field of nuclear fuel element welding, particularly relates to a positioning grid special-shaped spot-welding electrode, and aims to solve the problem that a grid direction needs to be continuously changed during the resistance spot welding of a domestic 300MW nuclear fuel assembly positioning grid, reduce the operation difficulty and improve the welding quality stability. The positioning grid special-shaped spot-welding electrode is characterized in that the positioning grid special-shaped spot-welding electrode is in a strip plate shape as a whole and is dividedinto a left part, a middle part and a right part; an end head is arranged on the left part and is in a right-angled trapezoid body shape, an upper bottom edge is arranged at the left end, a right-angled edge is arranged at the upper end, and a bevel edge is arranged at the lower end; an included angle between the right-angled edge and a horizontal line ranges from 6.85 degrees to 7.15 degrees, andan included angle between the bevel edge and the right-angled edge is 14 degrees; an arc-shaped section is arranged in the middle part and is in an 'S' shape as a whole, a 'V' concave part is arranged at the upper end, an included angle between the 'V'-shaped left side edge and the right-angled edge of the end head is larger than or equal to 20 degrees, and an included angle between the right side edge of the end head and the horizontal line is larger than or equal to 14.85 degrees; and a fixed end is arranged on the right part and is in a cuboid shape as a whole, and two fixing holes are formed so as to be used for fixing the electrode during welding.

Description

technical field [0001] The invention belongs to the field of nuclear fuel element welding, and in particular relates to a special-shaped spot welding electrode for a positioning grid. Background technique [0002] 300MW nuclear fuel assembly positioning grid, coaming spot welding position according to the position of the guide wing, there are three types of welding spots: left, right and forward. Since the guide wings are bent inwards, it is necessary to avoid the bent guide wings of the grid cells during the spot welding process, so the direction of the grid must be changed at any time according to the position of the welding spots. Change the position at any time to the right and to the right, so that the welding point can be welded without damaging the guide wing. [0003] Changing the welding position of the positioning grid at any time during the welding process, on the one hand, the operator is time-consuming and laborious, and it is difficult to ensure that the posit...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the orientation of the grid needs to be constantly changed during resistance spot welding of the domestic 300MW nuclear fuel assembly positioning grid, reduce the difficulty of operation, and improve the stability of welding quality

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