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首页> 外文期刊>Welding International >Development of hot wire TIG welding methods using pulsed current to heat filler wire - research on pulse heated hot wire TIG welding processes
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Development of hot wire TIG welding methods using pulsed current to heat filler wire - research on pulse heated hot wire TIG welding processes

机译：脉冲电流加热填充焊丝的热丝TIG焊接方法的发展-脉冲加热热丝TIG焊接工艺的研究

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The five categories are considered to be major problems which inhibit the workability of hot wire TIG welding. Two of these categories are considered in this paper; these are (1) magnetic arc blow and (2) arcing from the filler wire; these phenomena, the techniques developed as countermeasures and samples of practical application are reported in this article. 1 The occurrence of magnetic arc blow due to wire current hampers the workability because, during hot wire TIG welding, there is the filler wire in which a high current is flowing very close to the arc. 2 Wire heating using pulsed current (pulsed heating method: PH method) causes magnetic blow during only the wire pulsed current period (current flow period) and no magnetic blow occurs during non-pulse period (current flow suspension period). When the ratio of this pulse period is decreased, the ratio of the magnetic blow period becomes reduced and the workability is not so much damaged. 3 When a pulse arc is used and the wire current flows during the arc base period only when there is a sufficiently low arc current (hot wire switching TIG method: HST method), the effects of magnetic blow practically disappear. 4 Thearcing between the wire and the tungsten electrode and between the wire and the base metal can, in some circumstances, significantly hamper welding operations. 5 A DC pulsed power source is employed as a wire power source; contact between the wire tip and the base metal is detected (touch detection) from the wire voltage during the de-energised period; when the wire is detached from the base metal, the problem described above can be solved by suspending the wire current supply (touch detection control) for the succeeding pulse period. In order to prevent arcing from the wire, an AC power source with a direct output from an AC transformer should be avoided. 6 When the wire and the tungsten electrode are connected with different polarities, arcing from the wire can be prevented by inserting a high current switching transistor in the secondary side of the transformer and by switching on only during the pulsed period when the wire is in contact with the base metal. When the wire and the tungsten electrode are connected with the same polarity, arcing from the wire can be prevented by only an on/off control at the primary side of the transformer. 7 By means of the techniques described above arcing no longer occurrs from the wire even when the wire is detached from the base metal so TIG welding is facilitated by holding the arc torch in one hand and the hot wire torch in the other hand (two-handed semi-automatic hot wire TIG welding).
机译：这五个类别被认为是阻碍热丝TIG焊接可加工性的主要问题。本文考虑了其中两个类别。它们是（1）电弧吹和（2）填充焊丝产生的电弧;本文报道了这些现象，作为对策开发的技术和实际应用示例。 1由于焊丝电流引起的电弧放电会影响可加工性，因为在热丝TIG焊接过程中，存在填充焊丝，其中大电流非常靠近电弧流动。 2使用脉冲电流进行的线加热（脉冲加热方式：PH方法）仅在线脉冲电流期间（电流流动期间）引起磁吹，而在非脉冲期间（电流暂停期间）则没有磁吹发生。当该脉冲周期的比率减小时，磁吹周期的比率减小，并且可加工性不会受到太大的损害。 3当使用脉冲电弧并且只有在电弧电流足够低时（电弧线切换TIG方法：HST方法），电弧电流才会在电弧基期中流动，实际上磁吹的影响消失了。 4在某些情况下，焊丝与钨电极之间以及焊丝与母材之间的电弧会严重阻碍焊接操作。 5采用直流脉冲电源作为线电源;在断电期间，通过导线电压检测导线尖端和母材之间的接触（触摸检测）;当电线从母材上脱离时，可以通过在随后的脉冲周期中暂停电线电流供应（触摸检测控制）来解决上述问题。为了防止电线产生电弧，应避免使用交流变压器直接输出的交流电源。 6当电线和钨电极以不同极性连接时，可以通过在变压器的次级侧插入一个高电流开关晶体管，以及仅在电线接触时的脉冲周期内导通，来防止电线产生电弧与贱金属。当电线和钨电极以相同极性连接时，仅通过变压器一次侧的开/关控制就可以防止电线起弧。 7通过上述技术，即使将焊丝与母材分离，也不会从焊丝上产生电弧，因此通过一只手握住电弧炬和另一只手握住热焊炬（两根火炬，便于进行TIG焊接）手工半自动热丝氩弧焊）。

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