Friction stir welding method for lock bottom circular seam of carrier rocket storage tank
A technology of friction stir welding and launch vehicle, which is applied in the field of friction stir welding, which can solve the problems of poor plastic metal fluidity at the root of the weld, weak stirring ability, and the lock bottom structure is not suitable for the friction stir welding process, etc., and achieves the consistency of mechanical properties and Improved stability and improved performance
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[0024] A friction stir welding method for the bottom ring seam of a carrier rocket tank, including the following steps:
[0025] Step 1: Transform the welded parts
[0026] A welding drain 4 is opened on the fork ring 2 at the bottom of the box. The welding drain 4 is set at the bottom of the welding seam of the fork ring 2 at the bottom of the box and is 45° with the weld. The width of the welding drain 4 ranges from 1.0 to 1.5 mm, and the vertical depth is 1.5~2.0mm.
[0027] Step 2: Welding parts overlap
[0028] The welded box bottom fork ring 2 and the short shell 3 are overlapped together to form a weld.
[0029] Step 3: Welding
[0030] Use friction stir welding to weld along the weld.
[0031] The welding requirements are: ①When friction stir welding, place the fork ring 2 at the bottom of the box on the forward side of the weld (that is, the direction of rotation of the stirring tool on the side of the fork ring 2 at the bottom of the box should be consistent with the direction ...
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