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Thermal processing method for improving elongation of heat-treatable aluminum alloy welded joints

A technology of welding joints and thermal processing, which is applied in metal processing equipment, welding equipment, welding/welding/cutting items, etc., can solve the problems of reduced mechanical properties of welded joints, and optimize fracture path, disperse stress, and tensile strength Improved effect

Active Publication Date: 2018-08-21
CAPITAL AEROSPACE MACHINERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The reason is that after TIG welding of 2219 aluminum alloy, due to different degrees of Cu element segregation in the weld (WZ) and partially melted zone (PMZ), the structure of the overaging zone (OAZ) and heat-affected zone (HAZ) will also occur to a certain extent. The change of the welded joint reduces the mechanical properties

Method used

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  • Thermal processing method for improving elongation of heat-treatable aluminum alloy welded joints
  • Thermal processing method for improving elongation of heat-treatable aluminum alloy welded joints
  • Thermal processing method for improving elongation of heat-treatable aluminum alloy welded joints

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] For products with a model thickness of 8mm, the implementation parameters are shown in Table 1:

[0048] Table 1 Welding parameters of products with a thickness of 8mm

[0049]

[0050] Wherein, the size parameter of the second layer of cover satisfies a=2δ+b+3mm, h=1.5mm, a is the front width of the second layer of cover, b is the back width of bottom welding, and δ is the thickness of the workpiece to be welded , h is the frontal reinforcement of the second layer of covering, and the unit is mm.

[0051] The elongation of the first layer after welding is 3.5%, and the strength is 280‐290MPa. The elongation rate of the second layer cover after welding is 5.0%, and the strength is 320MPa.

Embodiment 2

[0053] For products with a model thickness of 10mm, the implementation parameters are shown in Table 2:

[0054] Table 2 Welding parameters of products with a thickness of 10mm

[0055]

[0056] Wherein, the size parameter of the second layer of cover satisfies a=2δ+b‐3mm, h=2mm, a is the front width of the second layer of cover, b is the back width of the bottom welding, δ is the thickness of the workpiece to be welded, h is the frontal reinforcement of the second layer of covering, in mm.

[0057] The elongation of the first layer after welding is 3.5%, and the strength is 280‐295MPa. The elongation rate of the second layer cover after welding is 5.5%, and the strength is 310MPa.

Embodiment 3

[0059]For products with a model thickness of 12mm, the implementation parameters are shown in Table 3:

[0060] Table 3 Welding parameters of products with a thickness of 12mm

[0061]

[0062] Wherein, the size parameter of the second layer of cover satisfies a=2δ+b+2mm, h=1.8mm, a is the front width of the second layer of cover, b is the back width of bottom welding, and δ is the thickness of the workpiece to be welded , h is the frontal reinforcement of the second layer of covering, and the unit is mm.

[0063] The elongation of the first layer after welding is 3.0%, and the strength is 290‐300MPa. The elongation rate of the second layer cover after welding is 5.5%, and the strength is 330MPa.

[0064] It can be seen from the above three embodiments that according to the method of the present invention, the mechanical properties of the joint of the workpiece to be welded are significantly improved, the tensile strength is increased from 280-300MPa to 310-330MPa, and th...

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Abstract

The invention belongs to the technical field of welding, and relates to a hot processing method for improving the elongation of a heat-treatable strengthened aluminum alloy fusion welding joint. The method includes the steps that at first, two heat-treatable strengthened aluminum alloy workpieces to be welded are fixed to a welding tool without cushion plate; and backing welding is conducted through direct-current helium-arc tungsten inert gas (TIG) welding, a first layer of cosmetic welding is conducted through variable-polarity pulse TIG welding, and finally a second layer of cosmetic welding is conducted through variable-polarity pulse TIG welding, so that welding of the two heat-treatable strengthened aluminum alloy workpieces to be welded is completed. According to the method, the second layer of cosmetic face is added, and by designing the technical parameters and dimension parameters, the tensile strength of the welding joint additionally provided with the second layer of cosmetic face is effectively improved, and the elongation is improved by 40%.

Description

Technical field: [0001] The invention relates to a thermal processing method, in particular to a thermal processing method for increasing the elongation rate of heat-treatable and strengthened aluminum alloy welded joints, and belongs to the field of welding technology. Background technique: [0002] The core tank of my country's launch vehicle is made of heat-treatable aluminum alloy, such as 2A14, 2219, etc. The weld seam is welded by single-sided two-layer automatic TIG welding. figure 1 As shown, the first layer adopts non-backing plate DC TIG welding to realize the bottom weld, and the second layer adopts polarity TIG welding to realize the cover weld. [0003] The advantages are mainly reflected in: [0004] 1) The pores and inclusions in the bottom welding process are easy to overflow, which reduces welding defects and improves welding quality; [0005] 2) The welding speed of bottom welding can reach more than 12m / h, which significantly improves the welding efficie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/167B23K9/235B23K9/12
CPCB23K9/12B23K9/167B23K9/235B23K2103/10
Inventor 王国庆刘宪力孟凡新田志杰李权熊林玉苏志强周庆宋建岭蒙丹阳
Owner CAPITAL AEROSPACE MACHINERY
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