Welding method of intermediate frequency amplifier

Abstract

The invention relates to a welding method of an intermediate frequency amplifier. The welding method comprises the steps that a focused laser beam serves as a heat source, the outsides of welding portions of two parts an upper cover plate and a shell of the intermediate frequency amplifier are directly welded for two times; the first time of welding is used for bottoming and plays a positioning effect, and the second time of welding is used for fixation and formation. The welding method has the advantages the method is simple to achieve, the outsides of welding portions of two parts the uppercover plate and the shell of the intermediate frequency amplifier are directly welded for two times; the first time of welding is used for bottoming and plays a positioning effect, and the second timeof welding is used for fixation and formation. Surface treatment before welding and cladding layer removal treatment after welding are not needed, single-face welding formation is adopted, the strength requirement for a welding head is met, accordingly the weld joint trimming and filing difficulty of a bench worker is reduced, the process is simplified, a processing period is short, the efficiency is high, the reliability and the welding quality are consistent, and the pass percent of machining reach 85% or above. Machining tools are not needed, and accessories of a laser welding machine aredirectly used for mounting and clamping parts.

Description

technical field [0001] The invention relates to a welding method for an intermediate frequency amplifier. Background technique [0002] At present, in the process of welding the cover plate and shell of the intermediate frequency amplifier, the first-time welding pass rate can only reach about 35%. The cover plate and the shell are connected by high-temperature soldering. Surface treatment is required before soldering. After soldering, the coating on the non-soldering parts needs to be removed, and subsequent processing is performed after passing the soldering. High-temperature soldering uses tin-lead solder as the connection For the transitional layer of the weld, the corresponding welding method should be adopted according to the structural characteristics of the parts and the requirements for the strength of the welded joint. For the welding of the upper cover plate and the shell of the intermediate frequency amplifier, double-sided welding should be used, and the amount...

AI Technical Summary

Problems solved by technology

For the welding of the upper cover plate and the shell of the intermediate frequency amplifier, double-sided welding should be used, and the amount of tin should be strictly controlled to control the size of the welding bump; 1) If the welding bump is too large, it will be difficult for the subsequent fitter to repair the file ;2) If the welding nodules are too small, it is easy to cause the welding scars to fall off when the coating is removed, resulting in unqualified parts processing

In the process of high-temperature soldering, since the surface treatment of the parts and the treatment of withdrawing the coating are carried out in the chemical solution, the chemical solution will damage the surface of the parts and the weld to varying degrees, and eventually cause the processing of the parts to be unqualified.

The notable shortcoming of prior art is: the first, high-temperature tin soldering is to adopt electric soldering body to heat, and the solder of heating and melting is coated on weld seam to realize welding, and the skill of the whole welding process and the proficiency to parts welding The level requirements are very high, and the welding process parameters and the amount of solder cannot be accurately controlled; second, the double-sided welding forming method is used, and the welding spatula is difficult to control, and since each part has four welds, the quality of each weld must be guaranteed It must be qualified and ensure consistency, so that it is possible to ensure that the welding of the parts is qualified, so the pass rate is not high, only about 35%; third, surface treatment is required before high-temperature soldering, and non-tin must be removed after high-temperature soldering The coating of the welded part should be processed after passing the standard. For unqualified products, it can only be repaired twice at most. Through such complicated processing, the efficiency is very low; fourth, the processing cycle is long, calculated by a single part: high surface treatment : 35min to 50min, soldering: 25min to 40min, welding seam repair: 30min to 50min, stripping layer: 30min to 50min, a total of 120min to 190min; it can be seen that the efficiency is very low; fifth, processing tooling is required to clamp parts

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