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首页> 外文期刊>International Journal of Ventilation >Controlling Gas Shielded Arc Welding Fumes using an On-Gun Extraction System
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Controlling Gas Shielded Arc Welding Fumes using an On-Gun Extraction System

机译：使用枪上抽气系统控制气体保护电弧焊烟气

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摘要

If inhaled, welding fumes can be harmful to health, thus exposure must be controlled. A commonly used method of control is local exhaust ventilation (LEV) in the form of moveable capturing hoods but, to achieve efficient capture, this type of ventilation must be positioned close to the fume source and moved as welding progresses, although in practice re-location may not always occur. Alternatively, control may be exercised using a low volume high velocity system (LVHV), fitted either to an existing welding torch or manufactured as an integral part of a torch. This type of system is commonly referred to as 'on-gun' extraction. Its primary benefit is that the extraction is always positioned close to the fume source and that it extracts less air than traditional moveable capture hoods. However, welders complain that the high velocity of the extracted air can remove the shielding gas and, hence, compromise weld metal integrity. Following tests to evaluate the effect of extract nozzle position, the capture efficiency of an integrated on-gun system was measured during bead on plate and horizontal/vertical fillet welding both in the flat and in position. Weld metal integrity was assessed by examining the welds produced during testing for porosity. Other factors such as ergonomics and operability were not assessed. The work showed that the integral on-gun fume extraction system evaluated provided efficient fume capture, without compromising weld metal integrity, and that the system was easy to optimise. However, some ambiguities remained regarding the capture efficiencies achievable during fillet welding in the flat and further work is required before the use of on-gun extraction can be recommended for this particular welding configuration.
机译：如果吸入，焊接烟雾会危害健康，因此必须控制暴露。一种常用的控制方法是采用可移动捕集罩形式的局部排气通风（LEV），但是为了实现高效捕集，必须将这种类型的通风装置靠近烟气源并随着焊接的进行而移动，尽管实际上位置可能并不总是发生。或者，可以使用小体积高速系统（LVHV）进行控制，该系统既可以安装在现有焊炬上，也可以作为焊炬的组成部分制造。这种类型的系统通常称为“机载”提取。它的主要优点是抽气始终位于靠近烟气源的位置，并且与传统的可移动收集罩相比，抽气量更少。但是，焊工抱怨说，高速抽出的空气会去除保护气体，从而损害焊缝金属的完整性。在进行测试以评估抽气嘴位置的影响之后，在平板和位置上的平板和水平/垂直角焊缝上的焊缝过程中，测量了集成式枪上系统的捕获效率。通过检查在气孔测试过程中产生的焊缝来评估焊接金属的完整性。未评估其他因素，例如人体工程学和可操作性。这项工作表明，所评估的整体枪上烟气抽取系统能够有效捕获烟气，而不会损害焊缝金属的完整性，而且该系统易于优化。但是，在扁平焊接中，在角焊期间可获得的捕集效率仍存在一些歧义，在针对这种特殊的焊接配置推荐使用枪上抽气之前，还需要进一步的工作。

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