Method for repairing pump impeller blade by laser cladding under assistance of friction stir welding
A friction stir welding and laser-assisted technology, which is applied in welding equipment, non-electric welding equipment, manufacturing tools, etc., can solve problems such as large performance differences and uneven organization, so as to improve bonding performance, improve repair quality, and reduce quality defects Effect
Active Publication Date: 2020-06-02
CHONGQING TECH & BUSINESS UNIV +2
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Problems solved by technology
Due to the rapid heating and rapid cooling during the laser cladding process, the difference in temperature gradient and thermal expansion coefficient between the cladding layer and the pump impeller base material will easily lead to defects in the bonding area of the cladding layer, such as pores, microcracks, slag inclusions, etc. The organization of the region is not uniform, and the performance varies greatly
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[0027] The implementation of the present invention will be illustrated by specific specific examples below, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.
[0028] It should be noted that terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit this specification. The practicable scope of the invention and the change or adjustment of its relative relationship shall also be regarded as the practicable scope of the present invention without any substantial change in the technical content.
[0029] figure 1 It is a schematic diagram of the blade of the present invention, and the blade is partially damaged (or called a missing block); the repair method of the present invention is applicable to the defect of the blade; when the blade has a crack defect, the blade nee...
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Abstract
The invention discloses a method for repairing a pump impeller blade by laser cladding under assistance of friction stir welding. The method comprises the following steps of performing cladding treatment on a defect area of the blade; repairing the defect area with a cladding material having similar mechanical properties to the blade through a laser cladding process; then heating the cladded bladeto 420 to 500 DEG C; performing friction stir welding on a bonding area between a cladding layer and the blade by adopting friction stir welding equipment to form a dense bonding layer in the bondingarea; and finally, cooling the blade to room temperature, and finishing the blade by adopting a machining center until the size meets the use requirements. In the method, the bonding area between a substrate and the cladding layer is machined by adopting the friction stir welding, thereby realizing tissue homogenization, reducing defects in the bonding area, and further improving the repairing quality of a pump impeller.
Description
technical field [0001] The invention belongs to the technical field of cladding repair, and in particular relates to a repair method for friction stir welding assisted laser cladding pump impeller blades. Background technique [0002] Laser cladding technology is an advanced technology for surface modification in the field of surface engineering. It refers to the use of high-energy laser beams to clad a layer of cladding layer on the surface of the base material to improve the surface performance requirements. The cladding material is melted by laser beam irradiation to form a molten pool, and then rapidly cooled and solidified by heat dissipation to obtain a coating with a fine structure and a metallurgical bond with the substrate. [0003] Friction stir welding is a high-speed rotating stirring head inserted into the workpiece and moving along the welding direction. Friction heat is generated at the contact part between the stirring head and the workpiece, so that a plasti...
Claims
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IPC IPC(8): B23P6/00B23K20/12B23K20/26C23C24/10
CPCB23P6/00B23K20/126B23K20/26C23C24/106
Inventor 许磊周志杰杜彦斌李方忠曹华军
Owner CHONGQING TECH & BUSINESS UNIV