Trapezoidal wave modulation welding current waveform

A welding current and trapezoidal wave technology, applied in welding equipment, manufacturing tools, arc welding equipment, etc., can solve the problems of loss, reduce welding stability, etc., achieve the effect of refining weld grains and reducing the incidence of pores

Inactive Publication Date: 2016-03-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This situation greatly reduces the welding stability, which wil

Method used

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  • Trapezoidal wave modulation welding current waveform
  • Trapezoidal wave modulation welding current waveform
  • Trapezoidal wave modulation welding current waveform

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0026] Example

[0027] Such as figure 1 Shown is the structure diagram of the trapezoidal wave modulated welding current waveform proposed by the present invention.

[0028] This waveform has the following characteristics:

[0029] 1. The waveform is composed of coupled low-frequency trapezoidal pulses and high-frequency rectangular pulses.

[0030] 2. The waveform is composed of strong pulse group, strong and weak transition pulse group, weak pulse group and weak strong transition pulse group.

[0031] 3. The number of strong and weak transition pulse groups in the waveform is the same as the number of weak and strong transition pulse groups.

[0032] 4. The peak current value of all high-frequency rectangular pulses in this waveform is the same.

[0033] 5. The peak current duration of all high-frequency rectangular pulses in this waveform is the same.

[0034] 6. The base current of the weak pulse group in this waveform is smaller than the base current of the strong pulse group.

[0035...

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PUM

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Abstract

The invention discloses a trapezoidal wave modulation welding current waveform which is used for controlling welding current. Welding current waveform is in periodical cycle; within each welding current waveform period, the welding current waveform comprises a strong pulse packet, a strong-weak transition pulse packet, a weak pulse packet and a weak-strong transition pulse packet, which are sequentially connected to form a continuous modulation waveform. In the waveform, number of pulses in the strong-weak transition pulse packet is the same as the number of pulse in the weak-strong transition pulse packet; peak current values of all high-frequency rectangular pulses are the same; and peak current lasting time of all high-frequency rectangular pulses is the same. Base current and number of pulses in the weak pulse packet in the waveform are smaller than the base current and the number of pulses in the strong pulse packet, but the base value lasting time of the weak pulse packet in the waveform is greater than the base value lasting time of the strong pulse packet. The trapezoidal wave modulation welding current waveform can form attractive welding waves, and has a plurality of advantages of being very wide in current regulating range, reducing a pore occurrence rate and refining welding seam grains.

Description

technical field [0001] The invention relates to the field of welding current waveform control, in particular to a trapezoidal wave modulation welding current waveform. Background technique [0002] Lightweight is the development trend of advanced molding technology today and in the future. Lightweight vehicles can not only save energy and reduce emissions, but also improve maneuverability and maneuverability. Aluminum alloy, with its high strength and low density, is a proven engineering material for lightweight manufacturing. Aluminum alloy materials are widely used in industries such as aviation, aerospace, high-speed rail, nuclear energy and ships, and welding is an essential process. The low melting point and high thermal conductivity of aluminum alloys cause defects such as cracks, weld collapse and weld penetration to occur frequently. However, there is often an oxide film on the surface of the aluminum alloy, which requires intensive energy to produce a cathode atom...

Claims

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Application Information

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IPC IPC(8): B23K9/09
CPCB23K9/092
Inventor 薛家祥王磊磊黄焯胜
Owner SOUTH CHINA UNIV OF TECH
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