Diffusion Welding Equipment Welding Method

The temperature of diffusion welding equipment is an important welding parameter of diffusion welding. In a certain temperature range, the diffusion process accelerates with the increase of temperature, and the strength of the joint increases accordingly. However, the increase of temperature is limited by the conditions of high temperature strength of fixture, phase transformation and recrystallization of welding parts, and the temperature is higher than a certain value.

It has little effect on the quality of the joint. Therefore, the heating temperature of solid phase diffusion welding of most metal materials is set at 0.6 - 0.8 Tm (K), in which Tm is the melting point of base metal. Diffusion time, heat preservation and diffusion time are not independent variables, but closely related to temperature and pressure, and can vary in a wide range.

At higher temperatures and pressures, it takes only a few minutes; on the contrary, it takes hours. Diffusion welding with intermediate layer also depends on the thickness of intermediate layer and the requirement of joint composition and uniformity of structure. Higher pressure leads to higher quality joints, and the relationship between joint strength and pressure. When the grain size or surface roughness of the weldment is larger, the pressure required is also higher.

The upper limit of pressure is limited by the total deformation of the weldment and the capacity of the equipment. In addition to thermal isostatic pressure diffusion welding, it is usually 0.5-50 MPa. Welding is a kind of welding method which has been developed early and is still widely used in various arc welding methods. The arc burns between the end of the electrode and the surface of the welded workpiece.

Coatings under the action of arc heat can produce gas to protect arc on the one hand, on the other hand, slag can be produced to cover the surface of molten pool to prevent the interaction between molten metal and surrounding gas. The more important role of slag is to produce physical and chemical reactions with molten metal or to add alloying elements to improve the properties of weld metal.

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