Method for forming reinforced-phase-strengthened composite welding seam structural material by regulating

Abstract

The invention discloses a method for forming reinforced-phase-strengthened composite welding seam structural material by regulating. The method comprises the following steps: separately cleaning the surfaces of a to-be-welded parent material, a composite material and brazing filler metal to remove an oxide film, stains and grease, and drying the to-be-welded parent material, the composite material and the brazing filler metal for later use; and then, assembling the materials according to a structure of parent material / brazing filler metal / composite material / brazing filler metal / parent material, putting the assembled materials into an ultrasonic auxiliary welding device, applying ultrasonic waves while heating and preserving the heat, starting a pressurizing device to carry out welding in case of reaching a predetermined temperature and ultrasonic fields, stopping ultrasonic action while the temperature is reduced to the room temperature after welding, and taking out a welded part, thereby obtaining the reinforced-phase-strengthened composite welding seam structural material. The method has the advantages and the positive effects that: the method is used for forming reinforced-phase-strengthened composite welding seam structural material by regulating, welding for metal and nonmetal can be carried out, bonding interface reaction is controllable, residual thermal stress is relatively small, and the bonding strength is relatively high.

Description

technical field [0001] The invention relates to the field of material processing and forming manufacturing, in particular to a method for forming a reinforced phase-strengthened composite weld structure material through regulation and control. Background technique [0002] The high-strength and reliable welding and connection of materials have broad application prospects in the fields of automobiles, ships, aerospace, petrochemicals, and daily products. However, in engineering application practice, there are many difficulties in achieving high-strength and reliable welding of materials. For example, there are problems such as brittle intermetallic compound layers, large residual thermal stress, and weak interface bonding in dissimilar metal welded joints. Ceramic material welded joints are easy There are problems such as weak bonding and large residual stress. These issues seriously affect the material to produce strong, reliable connections. Judging from the current resea...

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Problems solved by technology

[0005] The main problems in the above process are: during the welding process, the reaction of dissimilar metals is rapid, violent, and unavoidable, and the resulting brittle intermetallic compounds are difficult to withstand the stress, which is easy to cause cracking and reduces the mechanical properties of the welded joint.

At present, the idea of ​​reducing the impact of intermetallic compounds on dissimilar materials is generally to adjust welding parameters, optimize the process, reduce heat input, and then reduce the formation of intermetallic compounds, but dissimilar metals react quickly, and it is difficult to completely avoid them.

Dissimilar materials have poor mutual solubility. When melting and welding, the liquid phase separates, and when cooling and crystallizing, the weld composition is uneven and cracks are prone to occur; the thermal expansion coefficient is different, and the weld is prone to stress, causing welding deformation and crack initiation; the thermal conductivity is different. , the crystallization condition deteriorates, and it is easy to cause grain coarsening; the secondary oxide film on the surface of the metal material grows rapidly, which may cause inclusions, cracks, and affect the interface bonding; the cleaning process of the metal surface before welding is cumbersome, and the use of flux during the welding process will cause harm to personnel. Toxic and side effects, it is difficult to clean up the flux after welding, and it is easy to have adverse effects on the bonding interface

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