CN105436666A - Trapezoidal wave modulation welding current waveform - Google Patents
Trapezoidal wave modulation welding current waveform Download PDFInfo
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- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/09—Arrangements or circuits for arc welding with pulsed current or voltage
- B23K9/091—Arrangements or circuits for arc welding with pulsed current or voltage characterised by the circuits
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Abstract
本发明公开了一种梯形波调制焊接电流波形，用于控制焊接电流，该焊接电流波形为周期性循环反复，在每个所述焊接电流波形周期内包括：强脉冲群、强弱过渡脉冲群、弱脉冲群和弱强过渡脉冲群，上述各个脉冲群依次顺序连接，形成连续调制波形。该波形中强弱过渡脉冲群与弱强过渡脉冲群的脉冲个数相同，所有高频矩形脉冲的峰值电流值相同，所有高频矩形脉冲的峰值电流持续时间相同。该波形中弱脉冲群的基值电流和脉冲个数均小于强脉冲群的基值电流和脉冲个数，但是该波形中弱脉冲群的基值持续时间大于强脉冲群的基值持续时间。此梯形波调制焊接电流波形能够形成美观的焊波、具有很宽的电流调节范围、降低气孔发生率以及细化焊缝晶粒诸多优点。
The invention discloses a welding current waveform modulated by a trapezoidal wave, which is used to control the welding current. The welding current waveform is cyclically repeated, and each welding current waveform cycle includes: a strong pulse group, a strong and weak transition pulse group , weak pulse group and weak-strong transition pulse group, the above-mentioned pulse groups are sequentially connected to form a continuous modulation waveform. In this waveform, the number of pulses in the strong-weak transition pulse group and the weak-strong transition pulse group is the same, the peak current value of all high-frequency rectangular pulses is the same, and the peak current duration of all high-frequency rectangular pulses is the same. The base value current and pulse number of the weak pulse group in this waveform are both smaller than the base value current and pulse number of the strong pulse group, but the base value duration of the weak pulse group in this waveform is longer than the base value duration of the strong pulse group. The welding current waveform modulated by the trapezoidal wave can form beautiful welding waves, has a wide range of current adjustment, reduces the incidence of porosity, and refines the grains of the weld seam.
Description
技术领域technical field
本发明涉及焊接电流波形控制领域，具体是一种梯形波调制焊接电流波形。The invention relates to the field of welding current waveform control, in particular to a trapezoidal wave modulation welding current waveform.
背景技术Background technique
轻量化是当今和未来先进成型技术的发展趋势，运载工具的轻量化不仅能够节能减排，而且能够提高机动能力和操纵性能。铝合金具有高强度和低密度，是实现轻量化制造的一种行之有效的工程材料。铝合金材料广泛地应用于航空、航天、高铁、核能和船舶等行业，焊接是一个必不可少的加工过程。铝合金的低熔点和高导热性致使诸如裂纹、焊塌和焊穿等缺陷经常发生。但是铝合金表面常有氧化膜，需要密集的能量来产生阴极雾化效果去除氧化膜。因此输入母材的能量必须严格控制。钨极惰性气体保护焊满足铝合金的焊接要求并且能够得到少缺陷并且高质量的接头，但是相对于熔化极气体保护焊，低的熔覆率和浅的熔深限制了它的广泛应用。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 atomization effect to remove the oxide film. Therefore, the energy input into the base material must be strictly controlled. TIG welding meets the welding requirements of aluminum alloys and can obtain low-defect and high-quality joints, but compared with MIG welding, the low coverage rate and shallow penetration limit its wide application.
为了实现高效焊接铝合金，研究工作者做了大量的研究来改进焊接电源和优化焊接工艺，单脉冲熔化极气体保护焊和双脉冲熔化极气体保护焊都能够实现铝合金的焊接。然而单脉冲极易产生氢致裂纹，导致接头内部应力集中而发生失效断裂，其参数匹配也比较困难。双脉冲能够降低裂纹敏感性和气孔发生率，然而在传统的定速送丝双脉冲焊接中，弧长是不断变化的。在强脉冲群往弱脉冲群过渡时，弧长和干伸长达到最大，这时平均电流却突然减小，因此断弧经常在这个时间发生，当母材是冷的时候会更加严重。这种情况大大降低了焊接稳定性，在焊接昂贵精密工件时，会造成较大损失。In order to achieve high-efficiency welding of aluminum alloys, researchers have done a lot of research to improve welding power sources and optimize welding processes. Both single-pulse MIGA welding and double-pulse MIGA welding can achieve aluminum alloy welding. However, a single pulse is very easy to generate hydrogen-induced cracks, which leads to failure and fracture due to stress concentration inside the joint, and its parameter matching is also difficult. Double pulses can reduce crack sensitivity and porosity incidence, however, in traditional fixed-speed wire-feeding double-pulse welding, the arc length is constantly changing. When the strong pulse group transitions to the weak pulse group, the arc length and stem elongation reach the maximum, but the average current suddenly decreases, so the arc break often occurs at this time, and it will be more serious when the base material is cold. This situation greatly reduces the welding stability, which will cause great losses when welding expensive and precise workpieces.
发明内容Contents of the invention
本发明的目的在于克服现有技术的缺点与不足，提供一种梯形波调制焊接电流波形。该波形在传统的双脉冲波形中，加入了强弱过渡脉冲群和弱强过渡脉冲群。这样在强脉冲群往弱脉冲群过渡时，会经历一个强弱过渡脉冲群；在弱脉冲群往强脉冲群过渡时，会经历一个弱强过渡脉冲群。在强脉冲群往弱脉冲群过渡时，弧长和干伸长达到最大，这时强弱过渡脉冲群的存在致使平均电流逐渐减小，断弧现象得到显著抑制。其低频调制脉冲由于加入了强弱过渡脉冲群和弱强过渡脉冲群而由矩形变成梯形。该波形实现铝合金的高效焊接，得到缺陷极少，成型良好的接头。The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and provide a trapezoidal wave modulation welding current waveform. In the traditional double-pulse waveform, the waveform has added a strong-weak transition pulse group and a weak-strong transition pulse group. In this way, when a strong burst transitions to a weak burst, it will experience a strong-weak transition burst; when a weak burst transitions to a strong burst, it will experience a weak-strong transition burst. When the strong pulse group transitions to the weak pulse group, the arc length and stem elongation reach the maximum. At this time, the existence of the strong and weak transition pulse group causes the average current to gradually decrease, and the arc breaking phenomenon is significantly suppressed. Its low-frequency modulation pulse changes from rectangle to trapezoid due to the addition of strong and weak transition pulse groups and weak and strong transition pulse groups. This waveform enables efficient welding of aluminum alloys, resulting in well-formed joints with minimal defects.
本发明的目的通过下述技术方案实现：The object of the present invention is achieved through the following technical solutions:
一种梯形波调制焊接电流波形，用于控制焊接电流，所述焊接电流波形为周期性循环反复，在每个所述焊接电流波形周期内包括：强脉冲群、强弱过渡脉冲群、弱脉冲群和弱强过渡脉冲群，上述各个脉冲群依次顺序连接，形成连续调制波形。A welding current waveform modulated by a trapezoidal wave is used to control the welding current. The welding current waveform is cyclically repeated. In each cycle of the welding current waveform, it includes: a strong pulse group, a strong and weak transition pulse group, and a weak pulse Groups and weak-strong transition pulse groups, the above-mentioned pulse groups are sequentially connected to form a continuous modulation waveform.
进一步地，所述焊接电流波形的低频部分脉冲为梯形脉冲。Further, the pulse of the low-frequency part of the welding current waveform is a trapezoidal pulse.
进一步地，所述焊接电流波形的高频部分脉冲为矩形脉冲。Further, the pulse of the high-frequency part of the welding current waveform is a rectangular pulse.
进一步地，所述焊接电流波形在每个重复周期内的所述强弱过渡脉冲群与所述弱强过渡脉冲群中包含的脉冲数量相同。Further, the number of pulses included in the strong-weak transition pulse group and the weak-strong transition pulse group in each repetition period of the welding current waveform is the same.
进一步地，所述焊接电流波形的高频部分脉冲的峰值电流值相同。Further, the peak current values of the pulses of the high-frequency part of the welding current waveform are the same.
进一步地，所述焊接电流波形的高频部分脉冲的峰值电流持续时间相同。Further, the peak current durations of the high-frequency part pulses of the welding current waveform are the same.
进一步地，所述焊接电流波形在每个重复周期内的所述弱脉冲群的基值电流小于所述强脉冲群的基值电流。Further, the base value current of the weak pulse group in each repetition period of the welding current waveform is smaller than the base value current of the strong pulse group.
进一步地，所述焊接电流波形在每个重复周期内的所述弱脉冲群的脉冲个数小于所述强脉冲群的脉冲个数。Further, the pulse number of the weak pulse group is smaller than the pulse number of the strong pulse group in each repetition period of the welding current waveform.
进一步地，所述焊接电流波形在每个重复周期内的所述弱脉冲群的基值持续时间大于所述强脉冲群的基值持续时间。Further, the duration of the base value of the weak pulse group in each repetition period of the welding current waveform is longer than the base value duration of the strong pulse group.
本发明相对于现有技术具有如下的优点及效果：Compared with the prior art, the present invention has the following advantages and effects:
1)本发明公开的梯形波调制焊接电流波形能够形成美观的焊波。金属过渡主要发生在强脉冲群，焊道波峰是在强脉冲群产生的，焊道波谷是在弱脉冲群产生的。每个电流周期在焊道上面生成一个波峰和波谷，在焊接速度不变的情况下，焊道波峰和焊道波谷长度不变，多个周期就会在焊道上面形成美观的焊波。1) The trapezoidal wave modulation welding current waveform disclosed in the present invention can form beautiful welding waves. The metal transition mainly occurs in the strong pulse group, the weld bead peak is generated in the strong pulse group, and the weld bead trough is generated in the weak pulse group. Each current cycle generates a crest and a trough on the weld bead. When the welding speed is constant, the length of the weld bead crest and the weld bead trough remain unchanged, and multiple cycles will form beautiful welding waves on the weld bead.
2)本发明公开的梯形波调制焊接电流波形具有很宽的电流调节范围。虽然该波形中所有高频矩形脉冲的峰值电流值相同，所有高频矩形脉冲的峰值电流持续时间也相同，但是强脉冲群的基值电流、弱脉冲群的基值电流、强脉冲群的基值时间、弱脉冲群的基值时间、强脉冲群的脉冲个数和弱脉冲群的脉冲个数都是可以变化的，通过变换这些参数就可以得到很宽的平均电流。2) The trapezoidal wave modulation welding current waveform disclosed in the present invention has a very wide current adjustment range. Although the peak current values of all high-frequency rectangular pulses in this waveform are the same, and the peak current durations of all high-frequency rectangular pulses are also the same, but the base value current of the strong pulse group, the base value current of the weak pulse group, and the base value current of the strong pulse group The value time, the base value time of the weak pulse group, the pulse number of the strong pulse group and the pulse number of the weak pulse group can all be changed, and a wide average current can be obtained by changing these parameters.
3)本发明公开的梯形波调制焊接电流波形能够降低气孔发生率。电弧力与平均电流的平方成正比，该波形强脉冲群的平均电流远大于弱脉冲群的平均电流，所以强脉冲群的电弧力远大于弱脉冲的电弧力。强弱电弧力导致熔池产生上下对流运动，对流运动的频率接近熔池的共振频率，从而诱发熔池共振，该共振能够促使焊缝中的氢气溢出。3) The trapezoidal wave modulation welding current waveform disclosed in the present invention can reduce the occurrence rate of pores. The arc force is proportional to the square of the average current. The average current of the strong pulse group of this waveform is much greater than the average current of the weak pulse group, so the arc force of the strong pulse group is much greater than the arc force of the weak pulse. The strong and weak arc force causes the up and down convective motion of the molten pool, and the frequency of the convective motion is close to the resonance frequency of the molten pool, thereby inducing the resonance of the molten pool, which can promote the overflow of hydrogen in the weld.
4)本发明公开的梯形波调制焊接电流波形能够细化焊缝晶粒。强弱电弧力导致熔池产生上下对流运动，对流运动的频率接近熔池的共振频率，从而诱发熔池共振，该共振导致熔池凝固过程中，不断长大的晶粒被摩擦和剪切，抑制了晶粒的长大，而破碎的晶粒可以作为其他晶粒的异质形核点，从而进一步减小晶粒尺寸。细小的晶粒意味着优越的机械和力学性能。4) The trapezoidal wave modulation welding current waveform disclosed in the present invention can refine the weld grains. The strong and weak arc force causes the molten pool to produce up and down convective movement, and the frequency of the convective movement is close to the resonance frequency of the molten pool, thereby inducing the resonance of the molten pool, which causes the growing crystal grains to be rubbed and sheared during the solidification of the molten pool. The growth of grains is inhibited, and the broken grains can serve as heterogeneous nucleation sites for other grains, thereby further reducing the grain size. Fine grains mean superior mechanical and mechanical properties.
附图说明Description of drawings
图1是本发明提出的梯形波调制焊接电流波形组成结构示意图；Fig. 1 is a schematic diagram of the composition structure of the trapezoidal wave modulation welding current waveform proposed by the present invention;
图2是本发明提出的梯形波调制焊接电流波形的样本实时电流波形图；Fig. 2 is a sample real-time current waveform diagram of the trapezoidal wave modulation welding current waveform proposed by the present invention;
图3是本发明提出的梯形波调制焊接电流波形的样本实时电压波形图；Fig. 3 is the sample real-time voltage waveform diagram of the trapezoidal wave modulation welding current waveform proposed by the present invention;
图4是本发明提出的梯形波调制焊接电流波形的样本瞬时能量波形图；Fig. 4 is a sample instantaneous energy waveform diagram of the trapezoidal wave modulation welding current waveform proposed by the present invention;
图5是本发明提出的梯形波调制焊接电流波形的样本动态电阻波形图。Fig. 5 is a sample dynamic resistance waveform diagram of the trapezoidal wave modulation welding current waveform proposed by the present invention.
具体实施方式detailed description
为使本发明的目的、技术方案及优点更加清楚、明确，以下参照附图并举实施例对本发明进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
实施例Example
如图1所示为本发明提出的梯形波调制焊接电流波形的结构示意图。FIG. 1 is a structural schematic diagram of the trapezoidal wave modulation welding current waveform proposed by the present invention.
该波形具有以下特征：This waveform has the following characteristics:
1.该波形由耦合的低频梯形脉冲和高频矩形脉冲组成。1. The waveform consists of coupled low-frequency trapezoidal pulses and high-frequency rectangular pulses.
2.该波形由强脉冲群，强弱过渡脉冲群，弱脉冲群和弱强过渡脉冲群组成。2. The waveform consists of strong bursts, strong-weak transition bursts, weak bursts and weak-strong transition bursts.
3.该波形中强弱过渡脉冲群与弱强过渡脉冲群的脉冲个数相同。3. The number of pulses in the strong-weak transition pulse group and the weak-strong transition pulse group is the same in this waveform.
4.该波形中所有高频矩形脉冲的峰值电流值相同。4. The peak current value of all high-frequency rectangular pulses in this waveform is the same.
5.该波形中所有高频矩形脉冲的峰值电流持续时间相同。5. The peak current duration of all high-frequency rectangular pulses in this waveform is the same.
6.该波形中弱脉冲群的基值电流小于强脉冲群的基值电流。6. The base value current of the weak pulse group in this waveform is smaller than the base value current of the strong pulse group.
7.该波形中弱脉冲群的脉冲个数小于强脉冲群的脉冲个数。7. The number of pulses of weak bursts in this waveform is smaller than the number of pulses of strong bursts.
8.该波形中弱脉冲群的基值持续时间大于强脉冲群的基值持续时间。8. The duration of the base value of the weak burst in the waveform is greater than the duration of the base value of the strong burst.
该波形有以下功能：This waveform has the following functions:
实现铝合金的高效焊接，得到缺陷极少，成型良好的接头。Achieve high-efficiency welding of aluminum alloys and obtain well-formed joints with minimal defects.
该波形有以下优势：This waveform has the following advantages:
该波形能够形成美观的焊波。金属过渡主要发生在强脉冲群，焊道波峰是在强脉冲群产生的，焊道波谷是在弱脉冲群产生的。每个电流周期在焊道上面生成一个波峰和波谷，在焊接速度不变的情况下，焊道波峰和焊道波谷长度不变，多个周期就会在焊道上面形成美观的焊波。This waveform creates an aesthetically pleasing solder wave. The metal transition mainly occurs in the strong pulse group, the weld bead peak is generated in the strong pulse group, and the weld bead trough is generated in the weak pulse group. Each current cycle generates a crest and a trough on the weld bead. When the welding speed is constant, the length of the weld bead crest and the weld bead trough remain unchanged, and multiple cycles will form beautiful welding waves on the weld bead.
该波形具有很宽的电流调节范围。虽然高频矩形脉冲的峰值电流和峰值时间相同，但是强脉冲群的基值电流、弱脉冲群的基值电流、强脉冲群的基值时间、弱脉冲群的基值时间、强脉冲群的脉冲个数和弱脉冲群的脉冲个数都是可以变化的，通过变换这些参数就可以得到很宽的平均电流。This waveform has a wide current regulation range. Although the peak current and peak time of the high-frequency rectangular pulse are the same, the base value current of the strong pulse group, the base value current of the weak pulse group, the base value time of the strong pulse group, the base value time of the weak pulse group, and the The number of pulses and the number of pulses of the weak pulse group can be changed, and a wide average current can be obtained by changing these parameters.
该波形能够降低气孔发生率。电弧力与平均电流的平方成正比，该波形强脉冲群的平均电流远大于弱脉冲群的平均电流，所以强脉冲群的电弧力远大于弱脉冲的电弧力。强弱电弧力导致熔池产生上下对流运动，对流运动的频率接近熔池的共振频率，从而诱发熔池共振，该共振能够促使焊缝中的氢气溢出。This waveform can reduce the incidence of stomata. The arc force is proportional to the square of the average current. The average current of the strong pulse group of this waveform is much greater than the average current of the weak pulse group, so the arc force of the strong pulse group is much greater than the arc force of the weak pulse. The strong and weak arc force causes the up and down convective motion of the molten pool, and the frequency of the convective motion is close to the resonance frequency of the molten pool, thereby inducing the resonance of the molten pool, which can promote the overflow of hydrogen in the weld.
该波形能够细化焊缝晶粒。强弱电弧力导致熔池产生上下对流运动，对流运动的频率接近熔池的共振频率，从而诱发熔池共振，该共振导致熔池凝固过程中，不断长大的晶粒被摩擦和剪切，抑制了晶粒的长大，而破碎的晶粒可以作为其他晶粒的异质形核点，从而进一步减小晶粒尺寸。细小的晶粒意味着优越的机械和力学性能。This waveform enables grain refinement of the weld. The strong and weak arc force causes the molten pool to produce up and down convective movement, and the frequency of the convective movement is close to the resonance frequency of the molten pool, thereby inducing the resonance of the molten pool, which causes the growing crystal grains to be rubbed and sheared during the solidification of the molten pool. The growth of grains is inhibited, and the broken grains can serve as heterogeneous nucleation sites for other grains, thereby further reducing the grain size. Fine grains mean superior mechanical and mechanical properties.
利用本发明专利的梯形波调制焊接电流波形进行真实的焊接工艺试验。母材为3mm厚度的铝镁合金板，焊丝为1.2mm直径ER4043铝硅合金焊丝，焊接速度为53cm/min，保护气流为16L/min流量的高纯氩，焊丝干伸长14mm，送丝速度为3.7m/min。从母材的中心位置平板堆焊。试验结果如图2至图5所示。The real welding process test is carried out by using the trapezoidal wave modulation welding current waveform of the patent of the present invention. The base material is aluminum-magnesium alloy plate with a thickness of 3mm, the welding wire is ER4043 aluminum-silicon alloy welding wire with a diameter of 1.2mm, the welding speed is 53cm/min, the protective gas flow is high-purity argon with a flow rate of 16L/min, the dry elongation of the welding wire is 14mm, and the wire feeding speed is It is 3.7m/min. Flat surfacing from the center of the parent metal. The test results are shown in Fig. 2 to Fig. 5 .
图2为样本实时电流波形图。电流波形在单个周期内有明显的低频梯形脉冲。电流波形在多个周期内重复性较高。Figure 2 is a sample real-time current waveform diagram. The current waveform has obvious low-frequency trapezoidal pulses in a single cycle. The current waveform is highly repeatable over multiple cycles.
图3为样本实时电压波形图。电压波形在单个周期内低频梯形脉冲不太明显。电压波形在多个周期内重复性较高。Figure 3 is a sample real-time voltage waveform. The voltage waveform has less obvious low-frequency trapezoidal pulses in a single cycle. The voltage waveform is highly repeatable over multiple cycles.
图4为样本瞬时能量波形图。当断弧发生时，电流降到零，瞬时能量跌落到零。当短路发生时，电压降到零，瞬时能量跌落到零。由图4可知，瞬时能量没有跌落到零，这表明在焊接过程中断弧和短路没有发生。这证明了焊接过程是稳定的。Figure 4 is a sample instantaneous energy waveform diagram. When an arc break occurs, the current drops to zero and the instantaneous energy drops to zero. When a short circuit occurs, the voltage drops to zero and the instantaneous energy drops to zero. It can be seen from Figure 4 that the instantaneous energy did not drop to zero, which indicated that arc interruption and short circuit did not occur during the welding process. This proves that the welding process is stable.
图5为样本动态电阻波形图。当断弧发生时，电流降到零，动态电阻急剧上升。当短路发生时，电压降到零，动态电阻跌落到零。由图5可知，动态电阻没有急剧上升和跌落到零，这表明在焊接过程中断弧和短路没有发生。这证明了焊接过程是稳定的。Fig. 5 is a sample dynamic resistance waveform diagram. When an arc break occurs, the current drops to zero and the dynamic resistance rises sharply. When a short circuit occurs, the voltage drops to zero and the dynamic resistance drops to zero. It can be seen from Figure 5 that the dynamic resistance did not rise sharply and fell to zero, which indicated that arc interruption and short circuit did not occur during the welding process. This proves that the welding process is stable.
图4和图5显示瞬时能量和动态电阻波形在多个周期内重复性较高。瞬时能量和动态电阻的重复性表征了焊接过程的稳定型。因此可以认为焊接过程较为稳定。Figures 4 and 5 show that the instantaneous energy and dynamic resistance waveforms are highly repeatable over multiple cycles. The repeatability of instantaneous energy and dynamic resistance characterizes the stability of the welding process. Therefore, it can be considered that the welding process is relatively stable.
因此该梯形波调制焊接电流波形具有焊接过程稳定，重复性高，符合铝镁等轻质合金的焊接要求，具有很高的技术和经济价值。Therefore, the welding current waveform modulated by the trapezoidal wave has a stable welding process and high repeatability, meets the welding requirements of light alloys such as aluminum and magnesium, and has high technical and economic value.
上述实施例为本发明较佳的实施方式，但本发明的实施方式并不受上述实施例的限制，其他的任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化，均应为等效的置换方式，都包含在本发明的保护范围之内。The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations, Simplifications should be equivalent replacement methods, and all are included in the protection scope of the present invention.
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| CN113231714A (en) * | 2021-04-21 | 2021-08-10 | 广东开放大学（广东理工职业学院） | Aluminum alloy material mixed pulse group welding method, system, device and storage medium |
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