双变频器交流/直流GTAW机器薄焊缝,厚板

清洁行动,深穿透特性适合铝应用



ByAmanda Carlson

Although it existed in labs and specialty machines,dual-inverter technology did not arrive in the commercial welding machine market until 2000.这种机器被证明是非常有能力,但由于波形调整和控制范围广泛,需要一个实质性的学习曲线。

双逆变器as the name implies,is two inverters connected in series with each other.一次逆变器工作以优化输入功率,rectifying the AC input to DC and then "chopping" DC back to AC while substantially increasing its frequency.它被送入二次逆变器,用于设置输出焊接波形,rectifying the high-frequency AC to DC and then chopping DC back to AC while shaping the waveform (see图1).

OTC DAIHEN,Tipp City,Ohio,has added the WB-A350P,交流/直流钨极气体保护焊(GTAW)机,其Welbee系列焊接电源。Its dual-inverter architecture enables the use of the company's exclusive GTAW process: AC+DC Hybrid.

What Is AC+DC Hybrid Welding?

交直流混合焊接工艺,适合焊接铝的模式,结合正电极(EP)焊的清洁作用和负电极(EN)焊的深熔透和焦点,同时保持钨电极的形状(参见图2).

为什么清洁行动很重要?Aluminum oxide (Alo) forms naturally on the surface of aluminum and possesses a few traits that work against the welding process.第一,铝ois an electrical insulator,使其能很好地抵抗电弧焊所用电流的传导。第二,它的熔点是3762华氏度,英国williamhill这使得当下面的铝在1221华氏度熔化时很难去除。

The AC+DC Hybrid waveform is equipped to deal with this Alo涂层。其波形的交流部分交替为ep,创建所需的清理操作。这种“锤击”效应破坏了氧化层。极压电流的不良副作用是降低钨的形状,如果不选中,则将尖端舍入。为了抵消这一点,波形不平衡花费在ep上的时间和花费在en上的时间,reducing wear on the tungsten electrode and maintaining its shape (seeFigure 3).

The DC portion of the waveform uses EN for deep penetration of the focused current into the base metal.With reduced heat in the tungsten,it's possible to use smaller-diameter electrodes with sharper 英国williamhillpoints,支持低电流焊接,无不稳定电弧“跳动”。

总体而言,electrode tip shape and sharpness are maintained with no balling at the tip.结合焊缝熔深,arc focus,and arc stability,该模式可以解决铝GTAW的应用需求,如薄壁航空压力容器。

Waveforms

这种双逆变器技术支持三种类型的交流GTAW波形,它可以与AC+DC混合过程相结合,以更好地控制这种先进的能力。

    1.标准方波具有相等和平衡的en和ep电流周期。与从厚板到薄板的一系列应用相关,它是最通用的交流波形。

2.Hard square wave has periods of EN current that are greater and more unbalanced than EP current.The concentrated arc makes this AC waveform effective for thin-sheet fillet welds,with the byproduct of the high EN ratio being less electrode consumption leading to a more economical operation.

图1
双逆变器as the name implies,is two inverters connected in series with each other.

3.Soft sine wave has equal and balanced periods of EN and EP current.这种交流波形的噪声降低使它成为批量生产用户的最爱。Its wider arc is most effective for thin-sheet butt welds.

Arc Stability.This is another byproduct of the dual-inverter architecture.单逆变GTAW电机在增加补偿和/或增加频率时会很快失去电弧稳定性。The WB-A350P dual-inverter machine responds to the arc situation every 20 ns and is able to maintain arc stability through 90 percent EN offset up to its peak frequency of 500 Hz,from 5 amps of output to its peak of 350 amps.

自动化就绪。该机器支持现场总线接口(以太网/IP和现场总线),用于从手工焊接转换为半自动化和全自动化应用。这包括支持GTAW熔接以及送丝应用,including those where the wire feed is synchronized with the welding pulse output.它还包括通过其专有的CANBUS通信网络连接到制造商的FD系列焊接机器人。

Mike Monnin,总经理,and Phil Mosquera,OTC Daihen公司高级焊接工程师为本文贡献的信息。

OTC DAIHEN Inc.,1400 Blauser Drive,Tipp City,哦,45371,937-667-0800,网址:www.daihen-usa.com


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