Welding method of lower bend profile at bottom of high-speed rail train outer windshield

Abstract

The invention discloses a welding method of a lower bend profile at the bottom of a high-speed rail train outer windshield. The middle of an H-shaped profile is divided into two segments in T shapes, and after the two segments are bent correspondingly, a welding and welding tool installing and welding method is adopted for completing the welding method. According to the method, on one hand, the dimensional tolerance of the appearance after welding can meet the drawing requirement; on the other hand, the welding quality requirement of aluminum alloy welding is met; and an argon shield TIG welding machining tool, a friction stir welding machining tool and a pulse argon shield MIG welding machining tool are adopted in the welding method, finally the welding method of adopting the pulse argon shield MIG welding machining tool is determined by detecting the dimensional tolerance of parts through a welding strength test. The pulse MIG welding heat input quantity can keep the minimum quantity, the range of a heat effect area is small, and the weld joint strength meets the requirement of the aluminum alloy welding; the welding efficiency is high, and deformation is small; and the relative requirement for unevenness of welding clearances and welding faces is low, and 4mm plate butt-joint MIG welding can be within 1.5 mm.

Description

technical field [0001] The invention relates to a welding method, in particular to a welding method for a down-bending profile at the bottom of a high-speed rail outer windshield. Background technique [0002] The locomotive windshield is located at the junction of the two cars and is divided into an outer windshield and an inner windshield. It is the only way for passengers to divert from one compartment to the other. Therefore, it is also a safe passage. When the passenger train is overcrowded, the passing platform will also Carry some passengers, so the windshield is an important part connecting the locomotive and rolling stock. It must be safe and reliable, and it must have certain sealing performance and fire prevention performance. As the protective outer layer of the windshield, the outer windshield needs to prevent the intrusion of dirt, dust, water and snow. The outer windshield is composed of capsules and profiles, so the manufacture of the profiles determines the ...

AI Technical Summary

Problems solved by technology

As the protective outer layer of the windshield, the outer windshield needs to prevent the intrusion of dirt, dust, water and snow. The outer windshield is composed of capsules and profiles, so the manufacture of the profiles determines the quality of the entire outer windshield. The shape of the profiles must be in accordance with the section of the locomotive car The shape is designed and manufactured, and the shape and position tolerance of the shape must be controlled to meet the requirements. The down-bent profile is now bent as a whole on the profile bending machine. Since the profile is H-shaped, the bending radius is small, and the material is 6063-T6. High, the profile after bending often has cracks at the R fillet, the quality stability of the product is poor, and only about 50% of the qualified products seriously affect the product quality