Welding Method for Improving the Bearing Capacity of Aging Strengthened Aluminum Alloy Fusion Welding Joint

Abstract

A welding method for improving the bearing capacity of an aging-strengthened aluminum alloy fusion welding joint. Step 1: Use variable polarity plasma arc welding or DC tungsten helium arc welding to perform back welding on (2219 high-strength aluminum alloy) plates with a plate thickness of δ=8 to 12mm, and do one-time penetration without opening the groove to form the first first-layer welding seam; step two: using variable polarity tungsten argon arc welding or variable polarity melting electrode argon arc welding, cover welding the first layer of welding seam formed in step one to form the second layer of welding seam, and the second layer of welding seam The second-layer weld is trumpet-shaped, the weld depth of the second-layer weld is controlled at D2=0.5~0.6δ, and the width of the upper surface of the weld is controlled at W2=1.4~1.6δ Step 3: Use swing variable polarity argon arc welding The welding torch of the welding torch or the welding torch of variable polarity argon arc welding is carried out on the second layer of welding seam 2 formed in step two, and the second layer of welding seam is formed to form the third layer of welding seam; step four: use the cutting method to remove the first layer of welding seam 1 Back reinforcement.

Description

technical field [0001] The technology belongs to the field of welding, and specifically relates to a welding method for improving the bearing capacity of an aging-strengthened aluminum alloy fusion welding joint. Background technique [0002] For age-strengthened aluminum alloys 2A14, 2219, etc., when tungsten inert gas shielded welding (TIG) is used, the weld seam and the partial melting zone adjacent to the weld seam are the weakest areas (both strength and plasticity are low). Insufficient strength generally requires a certain weld reinforcement, and the existence of weld reinforcement makes the weld toe a place where stress and strain concentrate, and the weld toe is just in the weld and the partial melting zone adjacent to the weld, that is, The weakest area of ​​mechanical properties in the joint. In addition, in the existing fusion welding technology, the melting zone of the weakest part is basically perpendicular to the direction of transverse tensile load, and the ...

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Problems solved by technology

In addition, in the existing fusion welding technology, the melting zone of the weakest part is basically perpendicular to the direction of transverse tensile load, and the proportion of weak mechanical properties in the load-bearing area is large. The welding seam or partial melting zone expands, causing the joint to fail at lower loads, and the joint strength and elongation are lower

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