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Device and method for improving quality of aluminum alloy plasma arc welded joint

A plasma arc and welding joint technology, which is applied in the field of devices for the quality of plasma arc welding joints

Active Publication Date: 2014-02-19
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, there is no report on the combination of ultrasonic vibration and plasma arc welding to reduce the tendency of porosity during aluminum alloy welding and improve the quality of welded joints.

Method used

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  • Device and method for improving quality of aluminum alloy plasma arc welded joint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0036] (1) Comparative example:

[0037] A 5083 aluminum plate with a thickness of 10 mm is used as the workpiece to be welded, a butt joint test plate with a width of 10 cm and a length of 25 cm. The surface before welding is simply mechanically cleaned with an angle grinder. The plasma welding parameters are: ion gas 1.39L / min forward current 260A, Reverse 290A, welding speed 40mm per minute.

[0038] After welding, ultrasonic non-destructive testing is used to evaluate the porosity level, which is three grades. The porosity is mainly concentrated near the fusion line, and sometimes obvious large porosity can be seen in the cross section.

[0039](2) The welding parameters are the same as those of the comparative example, except that ultrasonic vibration is added, the vibration frequency of the ultrasonic vibration rod is 30KHz, the amplitude is 50um, and the ultrasonic tool head is 5 mm in front of the welding pool. Post-weld ultrasonic non-destructive testing is used to a...

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Abstract

The invention discloses a device and method for improving the quality of an aluminum alloy plasma arc welded joint. The device comprises a plasma arc welding machine. The plasma arc welding machine comprises a plasma arc welding gun and a plasma arc welding gun nozzle which is connected with the plasma arc welding gun and located below the plasma arc welding gun, wherein the plasma arc welding gun is connected with an ultrasonic vibration rod through a connection device, a vibration unit comprises a transducer, the ultrasonic vibration rod and an ultrasonic tool head all of which are connected in sequence, and the transducer is connected with an ultrasonic generator. On the premise of not changing original equipment, ultrasonic vibration is directly acted on the periphery of a welded joint through an auxiliary device, overflow of bubbles is increased through the ultrasonic vibration, and therefore the aims of overcoming defects of welding and improving welding quality are achieved.

Description

technical field [0001] The invention relates to a device and a method for improving the quality of aluminum alloy plasma arc welding joints. Background technique [0002] Due to its good physical, chemical and mechanical properties, aluminum alloys are increasingly used in various industrial products, especially in the aerospace, electronics and automotive industries. As an important thermal processing method for the application of aluminum alloys, welding plays an extremely important role. Compared with steel welding, aluminum alloy welding is more difficult, and welded joints are prone to defects. The main problem is that aluminum is easily oxidized to cause oxide slag inclusions, and defects such as pores and cracks are also prone to occur. [0003] Plasma arc welding is a new type of welding technology developed recently, which has the advantages of less heat input, concentrated energy density, and small deformation of the heat-affected zone. Moreover, because the plas...

Claims

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Application Information

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IPC IPC(8): B23K10/02B23K9/32
CPCB23K10/02B23K37/00B23K2103/10
Inventor 杜宝帅张忠文李新梅
Owner STATE GRID CORP OF CHINA
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