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Controlled perforation plasma arc welding system and process based on visual detection of small holes on the back

A plasma arc and visual inspection technology, used in plasma welding equipment, welding equipment, manufacturing tools, etc., can solve the problems of limited hole information, unable to give the shape and size of the small hole, etc., to ensure complete penetration and avoid melting. The effect of pool collapse and burn-through, ensuring welding quality

Inactive Publication Date: 2016-05-04
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, using such a tail flame voltage detection method can only obtain the indirect opening and closing state of the small hole, and the information of the small hole can be provided is very limited, and the specific data of the shape and size of the small hole cannot be given.

Method used

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  • Controlled perforation plasma arc welding system and process based on visual detection of small holes on the back
  • Controlled perforation plasma arc welding system and process based on visual detection of small holes on the back
  • Controlled perforation plasma arc welding system and process based on visual detection of small holes on the back

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Embodiment

[0082] Embodiment A controlled perforation plasma arc welding process based on visual detection of small holes on the back

[0083] Proceed as follows:

[0084] (1) Start: Select the appropriate current waveform parameters according to the material and thickness of the material to be perforated, including the base current I B and its action time T B , peak current I P and its action time T P , the falling slope K of the pulse trailing edge 1 、K 2 and its transition time T K1 , T K2 ;

[0085] (2) After selecting and setting the parameters, start welding. The CCD camera, composite filter device and Hall element collect the current waveform and the small hole image on the back in real time, and then transmit the information to the computer to calculate the size of the small hole and calculate the Deviation of the set value: ① If the deviation is less than the given value (the given value is the expected value of the small hole size on the back, which is preset according ...

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Abstract

The invention discloses a controlled perforation plasma-arc welding system on the basis of back small-hole visual inspection. The controlled perforation plasma-arc welding system comprises a welding machine system, an electric parameter acquisition system, a visual sensor system and a regulation and control system. The invention further discloses a controlled perforation plasma-arc welding process on the basis of the back small-hole visual inspection. The controlled perforation plasma-arc welding process includes the following steps: (1) starting: selecting appropriate current waveform parameters according to texture and plate thickness of materials to be perforated; and (2) starting welding after the parameters are selected and set, acquiring current waveforms and back small-hole images in real time, transmitting the information to a computer, calculating the size of a small hole, and calculating deviation of the size of the small hole and a set value until welding is finished. The controlled perforation plasma-arc welding system and process on the basis of the back small-hole visual inspection enables a one-pulse and one-hole welding mode to be expanded from welding of stainless steel sheets with thickness less than 4mm to welding of middle thickness plates with 8mm thickness, guarantees perforation of workpieces, enables the size of the small hole to be maintained at a value nearby a predetermined value, and effectively prevents a furnace hearth from collapsing and being burnt through.

Description

technical field [0001] The invention relates to a controlled perforation plasma arc welding system and process based on the visual detection of small holes on the back, belonging to the technical field of plasma arc welding quality control. Background technique [0002] Compared with laser welding and electron beam welding, perforated plasma arc welding equipment has low cost, simple operation, and strong adaptability to seam assembly gaps, so it has broad application prospects in the processing and manufacturing of various alloy material structures. Perforated plasma arc welding is a high-energy-density welding process, but due to the unique physical characteristics of the plasma arc, conventional perforated plasma arc welding has some problems, such as poor stability of molten pool holes and sensitivity to changes in welding process conditions , the range of reasonable specification parameters to obtain good joint quality is narrow, and the adjustable margin is small. In ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K10/02
Inventor 武传松刘祖明张国凯王林
Owner SHANDONG UNIV
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