When selecting the fume shroud for your fume extraction torch, it is important to know the benefits and drawbacks of each. In this video, we compare the three most common fume shroud designs so that you can choose the best one for your welding application.
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The fume shroud is a part of the fume extraction torch that sits on or behind the nozzle. The shroud has openings to allow the vacuum to direct the fumes away from the welder, into the torch, and back to your filtration system. Let's look at the difference between slip-on shrouds and threaded shrouds. The biggest advantage of the slip-on is its adjustability. You can move it forward or backwards depending on if you need more or less vacuum, but we should also explore some of the potential downsides that come with the slip-on shroud. First, it's bulkier and can compromise your vision of the weld pool. Because the shroud works best close to the arc, you can run into issues with extracting shielding gas. This is especially true if your fume extraction unit is set to high. Threaded shrouds sit further back from the welding arm. This allows for minimal interference in the welding process and ensures quality welds. The biggest advantage of the threaded shroud is its size. The threaded shroud is typically less bulky and provides better access and visibility of the weld. The larger openings allow for greater flow, capturing more welding contaminants. For optimal performance, you will need a stronger fume extraction system. Let's focus on openings for a moment. The slip-on shrouds, you tend to see less variety. You typically see smaller openings as well as the shroud is closer to the weld. With threaded shrouds, options are more varied. Options range from slim taper designs with larger openings to larger designs with smaller openings. Both have their specialty. The slim design is for tight-access welding, and the larger design is for vertical and out-of-position welding. The three most common materials used in the fume shroud are brass, chrome-plated brass, and black-anodized steel. Brass is the most common and the least expensive. Brass is also the least physically durable. Spatter and other debris easily fuse with the brass causing blockage of your shroud openings. Chrome plating the brass provides more durability than brass alone. Spatter is less likely to stick to the protective coating making cleaning your shroud much easier. Black-anodized steel has the most mechanical strength and physical durability of the three we've discussed. The black anodization provides corrosion and spatter resistance. This makes the black-anodized steel shroud last longer in a production environment.
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