Welding method suitable for thick plate type aluminum alloy

A welding method and aluminum alloy technology, applied in welding equipment, welding/welding/cutting items, arc welding equipment, etc., can solve the problems of large welding deformation, high requirements for auxiliary tooling, and poor accessibility, so as to improve welding efficiency, Realize shape control and controllability adjustment, improve the effect of blunt edge thickness

Active Publication Date: 2020-04-28
TIANJIN AEROSPACE CHANGZHENG ROCKET MFGCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of this, the present invention aims to propose a welding method suitable for thick-plate aluminum alloys, which solves the problems in the traditional thick-plate welding process that the amount of deposited metal needs to be filled and the weld seam shrinks unevenly in the thickness direction. Technical problems that lead to large welding deformation;
[0008] And it further solves the problem that in the traditional thick plate welding process, when welding large products, the accessibility of back welding is poor, the welding position is inconvenient, the requirements for auxiliary tooling are high, and frequent product turnover seriously affects Technical Problems of Labor Productivity

Method used

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  • Welding method suitable for thick plate type aluminum alloy
  • Welding method suitable for thick plate type aluminum alloy
  • Welding method suitable for thick plate type aluminum alloy

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Effect test

Embodiment 1

[0078] Embodiment 1, the third layer of cover welding 22 is AC TIG argon arc welding without torch swing

[0079] The invention ensures that one weld can cover the entire groove width through precise adjustment of welding process parameters, and at the same time ensures that the fusion zones of the two-layer cover welds do not overlap, thereby avoiding the deterioration of the structure and performance of the weld. Like the second layer of cover welding 21, low-frequency pulse variable polarity TIG welding is also used, in order to obtain the final appropriate weld shape, that is, to maintain an appropriate weld shape coefficient (ratio of fusion width to penetration depth), the third layer of cover welding 22 increases the welding current compared with the second layer of cover welding 21, and at the same time appropriately increases the arc voltage, so that the arc voltage and welding current maintain a proper match relation;

[0080] In this embodiment, the parameters of ...

Embodiment 2

[0086] Embodiment 2, the third layer cover surface welding 22 is AC TIG argon arc welding with torch swing

[0087] In the present embodiment, the parameters of the U-shaped groove are a=18mm, b=12mm, R=3mm, p=12mm, δ=15mm, the gap between the two workpieces 10 to be welded is 0.2mm, and the staggered seam is 0.3mm. mm;

[0088] Welding conditions for tack welding: welding current 240A, welding speed 15m / h;

[0089] Welding conditions for the first layer of bottom welding 20: use arc welding to carry out bottom welding on the two workpieces 10 to be welded, the diameter of the selected tungsten pole is 5mm, the angle of the tip of the tungsten pole is 60°, the diameter of the tip is 2.5mm, and the length of the tip is extended 8mm, adjust the distance between the tip of the tungsten electrode and the workpiece 10 to be 2mm before welding; the welding current is 320A, the welding speed is 10m / h, the arc voltage is 14.5V, the shielding gas is 99.999% high-purity helium, and the...

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Abstract

The invention provides a welding method suitable for a thick plate type aluminum alloy. The welding method comprises the following steps that S1, welding grooves are formed in the adjacent to-be-welded end faces of two to-be-welded workpieces correspondingly, the two welding grooves form a U-shaped groove, and the U-shaped groove is arranged in an axial symmetric mode by taking a center line of agap between the two to-be-welded workpieces as an axis; and S2, backing welding of a first layer, cosmetic welding of a second layer and cosmetic welding of a third layer are sequentially performed inthe U-shaped groove from bottom to top. According to the welding method suitable for the thick plate type aluminum alloy, the technical problem that in a traditional thick plate welding process, theamount of deposit metal required for filling is relatively large, and a weld joint is non-uniformly contracted in thickness direction, so that generated welding deformation is relatively large is solved.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a welding method suitable for thick-plate aluminum alloys. Background technique [0002] Aluminum alloy has excellent physical and chemical properties, and is widely used in the manufacture of rocket body structures of various space vehicles. The physical and chemical properties of aluminum alloy determine that the welding process of aluminum alloy is different from that of steel. The surface of aluminum alloy is easily oxidized to form a dense, refractory, and highly water-absorbing oxide film, which is likely to cause defects such as weld slag inclusions and pores; the specific heat capacity and thermal conductivity of aluminum alloys are high, resulting in the required heat input when welding aluminum alloys Larger than steel, excessive heat input can easily cause structural deterioration; aluminum alloy has a large linear expansion coefficient, and the tendency ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K9/025B23K9/235B23K33/00B23K103/10
CPCB23K9/167B23K9/025B23K9/235B23K33/004B23K2103/10
Inventor 宋建岭丁吉坤蒙丹阳刘宪力顾中华周亚男田龙张慧峰王惠苗邓利芬梁双丰郑超群刘琦辉
Owner TIANJIN AEROSPACE CHANGZHENG ROCKET MFGCO
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