Method for T-shaped magnesium alloy section friction stir welding

A technology of friction stir welding and welding method, which is applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problem of low connection strength, and achieve the effects of strong thickness adaptability, high efficiency, and small heat-affected zone

Inactive Publication Date: 2014-11-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of low connection strength of existing magnesium alloy T-shaped joints, the object of the present invention is to provide a welding method for friction stir welding of T-shaped magnesium alloy profiles

Method used

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  • Method for T-shaped magnesium alloy section friction stir welding
  • Method for T-shaped magnesium alloy section friction stir welding
  • Method for T-shaped magnesium alloy section friction stir welding

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The 12mm thick AZ31 magnesium alloy is subjected to friction stir T-welding. The size of the two wall plates is 290mm×115mm×12mm, the size of the rib plate is 290mm×230mm×12mm, and the tensile strength of the base metal (magnesium alloy) is 268MPa. The shaft shoulder of the stirring head used is in the shape of a double concave ring with a diameter of 24mm; the stirring needle is a tapered right-handed thread with a diameter of 5-7mm and a length of 11.7mm. Butt and fix the three plates to be welded on the backing plate with auxiliary pads, and then use the tooling to clamp the auxiliary pads of the wall plate, the three magnesium alloy profiles to be welded and the auxiliary pads of the rib plate laterally on the welding workbench superior. When welding starts, the stirring head is inserted into the butt surface of the wall plate and the rib plate at an insertion speed of 20mm / min, and the pressing amount of the shaft shoulder is 0.2mm, and stays for 2s; when starting ...

Embodiment 2

[0030] The 8mm thick AZ31 magnesium alloy is subjected to friction stir T-welding. The size of the two wall plates is 230mm×90mm×8mm, the size of the rib plate is 230mm×180mm×8mm, and the tensile strength of the base metal is 268MPa. The shaft shoulder of the stirring head used is in the shape of a double concave ring with a diameter of 22 mm; the stirring needle is a tapered right-handed thread with a diameter of 3-5 mm and a length of 7.7 mm. Butt and fix the three plates to be welded on the backing plate with auxiliary pads, and then use the tooling to clamp the auxiliary pads of the wall plate, the three magnesium alloy profiles to be welded and the auxiliary pads of the rib plate laterally on the welding workbench superior. When welding starts, the stirring head is inserted into the butt surface of the wall plate and the rib plate at an insertion speed of 20mm / min, and the pressing amount of the shaft shoulder is 0.2mm, and stays for 2s; when starting to move, keep the ro...

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Abstract

The invention provides a method for T-shaped magnesium alloy section friction stir welding. The method specifically comprises the following steps: alcohol is used for cleaning oil greasy dirt on alloy sections to be welded before welding; on the two sides of a magnesium alloy rib plate, a pair of auxiliary cushion blocks with a shape which is consistent with the shape of the plate is assembled; two magnesium alloy blocks with same geometric size are installed on the auxiliary cushion blocks of the rib plate as wallboards, and auxiliary cushion blocks are assembled on the two sides of the wallboards; by using a tooling, the auxiliary cushion blocks of the wallboards, three magnesium alloy sections to be welded and the auxiliary cushion blocks of the rib plates are transversely clamped on a welding bench; a main shaft of a friction stir welding machine rotates, is gradually inserted into one butting surface of the wallboards and the rib plate sections, is stopped for a while and horizontally moves to start welding, the welding is ended after the main shaft reaches an end point, and a stirring head is drawn out; parallel welding is conducted to the other butting surface, wherein the center spacing between the two weld seams is the thickness of the rib plate.

Description

technical field [0001] The invention belongs to the technical field of welding technology in material processing engineering, and in particular relates to a welding method for friction stir welding of T-shaped magnesium alloy profiles. Background technique [0002] Magnesium alloy has excellent characteristics such as high specific strength and specific stiffness, good dimensional stability, good vibration damping, thermal conductivity, castability and machinability, etc. It is currently the lightest metal structural material and special-purpose function in industrial applications Material. At present, a large number of profiles are used in the design and construction of aerospace, ships, and rail transit, and the widely used profile is T-shaped profile, which is usually used in fuselage, shell plate, cabin and other positions. Its application can reduce the number of parts, reduce weight and improve service life. [0003] At present, T-joints are mainly realized by manual...

Claims

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Application Information

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IPC IPC(8): B23K20/12
CPCB23K20/1225B23K2103/08
Inventor 杨素媛刘冬冬王扬卫程兴旺王富耻
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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