Flash welding forming method of iron-based high-temperature alloy ring part with large section

Abstract

The invention discloses a flash welding forming method of an iron-based high-temperature alloy ring part with a large section. The method comprises the steps that an iron-based high-temperature alloy large-section ring blank with an opening is fixed on a clamp firstly, a power source is switched on, current passes through the back portion to reach the right end from the left end to form circular current, and preheating is performed; then the right end is driven to be close to the left end, and weak flashing is carried out; the feeding speed is increased, the current is adjusted, strong flashing is carried out, and a temperature field is formed; according to the temperature field, the lengths of a high-temperature mushy zone and a high-temperature tissue coarsening zone are worked out, and therefore the upset forging distance is determined, and upset forging is carried out; pressure is kept for a certain time. The method can form the stable and reasonable temperature field, metal at the high-temperature mushy zone can be fully jacked out of a base body in the upset forging process, metal at the high-temperature tissue coarsening zone can fully plastically deform, grains are refined through recovery and recrystallization, and the flash welding ring part with high quality is obtained. The method is used for flash welding forming of ring parts with large sectional areas.

Description

technical field [0001] The invention relates to a welding method, in particular to a flash welding forming method of an iron-based superalloy large-section ring. Background technique [0002] Flash welding is a kind of solid-state welding. A certain temperature field is formed on the two welding end faces of the workpiece through flashing, and then the workpiece is welded by the action of upsetting force. Therefore, a reasonable match between the temperature field and the upsetting parameters is the key to achieving high-quality welding. A suitable temperature field can provide suitable diffusion activation energy for the metal atoms, accelerate the mutual diffusion of atoms at both ends during the upsetting deformation process, and meet the requirements of the upsetting process. Process metal plastic deformation requirements, and the establishment of the temperature field is mainly determined by the flash stage. The temperature field formed by the flash process is mainly d...

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Problems solved by technology

Although this method can form a temperature field, it does not disclose specific process parameters, and this method uses intermittent preheating to establish a temperature field and a flash process to adjust the temperature field, so the process is discontinuous. The formed temperature field is unstable, which will have a certain impact on the welding quality

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