What Is Fume Extraction Arms?
A fume extraction arm is a specialized device designed to capture and remove hazardous fumes and dust directly at their source before they can disperse into the workshop environment. It comprises a flexible, movable arm with two or three rotating joints, a hood or nozzle at one end, and is positioned close to the welding or work area.
On the other end, the base can usually swivel and is connected to a vacuum unit with a filtration system or external exhaust. This setup ensures that harmful particles are efficiently extracted from the welder's breathing zone.
Advantages of Fume Extraction Arms
Targeted extraction
Fume extraction arms capture contaminants at the source, effectively preventing the spread of fumes into the wider work environment and preventing fumes from entering the breathing zone.
Flexibility and versatility
The articulated design of the fume extraction arm is easily repositioned to accommodate a variety of tasks or workstations without the need for multiple extraction units.
Cost effectiveness
Because the fume extraction arm's approach is more targeted, it typically requires less energy than a whole room ventilation system, reducing operating costs.
Easy installation
Fume extraction arms are typically easier and quicker to install than larger, more complex ventilation systems. This is particularly beneficial for smaller businesses or facilities that need to be up and running quickly.
User friendly
Fume extraction arms are typically easy to operate, with simple controls and simple maintenance requirements.
Space savings
Due to their targeted nature and smaller size, fume extraction arms are ideal for work environments with limited space.
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Extraction Method of Fume Extraction Arm
Fume extraction arm
The fume extraction arm has filters mounted inside a frame with castors. It consists of a vent pipe or an arm connected to a blower. It requires the vent pipe to be placed in the center to be effective. Therefore, when the welding object moves, the arm must also move. It also requires frequent filter changes.
Self-contained downdraft bench
In a self-contained downdraft bench, the filter is placed inside the bench and the blower extracts air from the environment. This technology has minimal installation requirements and costs as much as a fume extraction arm. Self-contained downdraft benches are the safest solution for welding and grinding purposes.
Air-contained downdraft benches
These benches rely on the operation of a central fume and dust collector to take the collected air away from the operator and into an external collector. They have no ducting and do not require power. A major advantage of this technology is that air-contained downdraft benches are highly customizable and flexible, but they come with a lot of additional costs in terms of installation and scalability.
Central fume and dust collectors
Airless downdraft workbenches are connected to a central fume and dust collector via ductwork. They don't require much maintenance, as the filters typically only need to be changed once a year, although this will vary depending on the type of metal being welded and how oily or dirty the metal surface is.
Suspended ambient air purifiers
Suspended ambient air purifiers are used as a secondary cleaning system to remove harmful fumes that remain after the primary solution. These units are typically mounted 12-14 feet off the floor, suspended from the ceiling or mounted on a wall. Generally speaking, they are an affordable and quick solution.
Welding fume extraction
These systems are designed specifically for welding processes. They capture the fumes generated during welding, ensuring that workers are not exposed to hazardous substances.
Robotic welding extractors: These are specialised for robotic welding setups, providing efficient extraction of fumes in automated welding processes.
3d printing fume extractors
With the rise of 3d printing, these extractors are becoming increasingly important. They remove the fumes and particulates released during the printing process, ensuring a safe environment.
Portable fume extractors
Ideal for smaller spaces or where flexibility is needed, portable fume extractors can be moved to different locations as required.
Centralised extraction systems
These are large-scale systems designed for industrial environments with multiple extraction points. They are highly effective in maintaining clean air quality throughout large facilities.
Downdraft tables and benches
These are work surfaces with built-in extraction capabilities, ideal for capturing fumes and dust at the source during processes like grinding or soldering.
Application of Fume Extraction Arms
Laser
Technology has advanced a lot today and laser technology is one of the most sought manufacturing facilities. There are several processes like laser cutting, laser cleaning, laser engraving, and laser marking which involves chemicals and releases a lot of toxic contaminants that possess health and safety risk to the people and surroundings involved.
Special fume extraction systems are being designed nowadays that are designed to extract fumes and other harmful airborne particles generated from processes involving lasers.
Electronics
In the electronics industry, fumes are generated mainly from the repeated use of cleaning chemicals, resins and solvents which will release harmful fumes into the atmosphere.
Failure to extract these fumes will lead to potential health risks over time. Soldering is one of the major processes done in the electronics industry that causes the generation of these fumes. This makes it important to have a proper fume extraction system equipped in electronics industries.
Printing
D printing is very popular, there are a lot of reasons why it's being accepted and at the same time, there are reasons why certain measures need to be taken to reduce or eliminate the risks associated with it.
Why 3d printing is widely accepted because these printers can create customized solutions at a very minimal cost and with less waste. As with any process comes with an advantage and disadvantages, one of the main disadvantages of this process is its generation of fumes, pungent odours and combustibles dust into the atmosphere.
In cases where 3d printing works continuously, the potential risks associated with it also increase manifolds. Hence it's important to have fume extraction systems specially designed with controls to provide filtered clean air to the atmosphere.
Mechanical industries
Manufacturing industries where a lot of metalwork is involved will release harmful fumes that are likely to cause short-term and long-term health risks. Hence, it's important to have a proper fume extraction system that will protect the workers from any nervous, respiratory, or skin problems.
Positioning a fume extraction arm is crucial for maximizing its efficiency in capturing hazardous fumes. The ideal placement depends on the welding task's orientation and your workspace's specific setup. Here are general guidelines to ensure optimal performance:
When positioned next to the weld pool
Aim to place the extraction hood approximately one diameter of the arm's length away from the weld pool. This proximity allows the arm to effectively capture fumes as they rise without interfering with the welding process or obstructing the welder's view.
When positioned above the weld pool
If the arm is positioned above the welding area, it should be approximately three diameters of the arm's length away from the weld pool. This distance ensures that the extraction hood can efficiently draw up fumes without being too close.
In both cases, it's essential to adjust the arm so that it does not obstruct the welder's movement or line of sight while still ensuring it remains close enough to capture the maximum amount of fumes. Regular adjustments may be needed based on the specific welding task and changes in the direction or amount of fumes produced.
Extraction Method of Fume Extraction Arm
This is a method where extraction is done at the tip of the soldering iron tip and is drawn through a small bore tubing and tube assembly to an extractor unit. By using the BOFA universal soldering iron kit a1090025 or esd version a1090026, the small bore extraction tube can be positioned to extract the fumes and deliver them to a single user system such as the small bench top BOFA t1 system or the larger multi user system BOFA t15. The system can handle up to 15 soldering irons and the small bore tubing is connected to a 50mm rigid tubing which ultimately connects to the main t15 unit. Important - one thing to be aware of when using the small bore tip extraction method is that the metal tube will slowly accumulate condensed flux which will settle out during the extraction process. We provide a tube cleaning brush and the metal tube should be cleaned as part of a weekly maintenance schedule. The smaller internal diameter will reduce the efficiency of the pump and airflow if allowed to accumulate. Another way to clean the tube is to soak it in a saponifier cleaning solution which will break down the flux residue into soap which can then be easily rinsed away with water.
This form of extraction is performed by placing a flexible arm close to the soldering operation and fume generation. It offers more options for extraction not only during hand soldering but also during processes such as using solder pots, preheater hot plates, potting and applying adhesives.
An example of a simple setup using a single arm system is shown here, the BOFA v 200 single arm system. It is portable and the main unit can be easily moved and the arm mounting kit can be clipped onto a side table or by mounting the arm directly to the bench top.
This is the ideal method for maximum capture capacity and safety. By installing a hooded enclosure, the generated fumes are confined to the work area and drawn out to the extraction unit. This is a perfect method for capturing fumes, vapors and extraction gases during soldering, bonding and conformal coating processes.
How to Maintain Fume Extraction Arms
Clean out the dust tray
When consulting a basic maintenance guide for fume extractor systems, arguably the most frequent service your shop needs to do is cleaning out the dust tray. Obviously, this is the compartment where your extractor stores the heavy particulate matter it sucks up, holding it in a safe place for you to dump at your convenience. A buildup of sediment is a constant issue you need to deal with, and ensuring your dust tray is free from this buildup is a daily job.
Letting the tray hold more debris than the design allows for can lead to drops in performance, lowering the efficiency of your extractor. Aside from decreasing effectiveness, an overflow in your dust tray can damage internal systems, causing wear and tear throughout your extractor. This will only lead to more mechanical issues, significantly affecting the reliability and safety of your equipment.
Inspect all filters
Aside from your dust tray, you need to regularly inspect your filter for any excess buildup of debris. Your filters will absorb much of the smaller particulate matter that the dust tray can't safely store, holding it until you clean out or replace your filter. But like your dust tray, your filter can clog with sediment.
Most larger fume extraction systems will have a pressure differential gauge to alter when the filter clogs with material. But this feature is absent from most smaller systems, meaning you'll need to check on the filter yourself to catch any excess buildup. Letting your filters clog with sediment will stress the entire system, decreasing the strength of your extractor's suction. Just like a clogged dust tray, an overwhelmed filter will not adequately vacuum fumes and dust, exposing employees to dangerous materials.
Have clean compressed air
In order to clean your filters, most shops use compressed air to blow out the sediment buildup; however, you need to be aware of the cleanliness of the air you use. If you use dirty, oily, or wet compressed air, then it will negatively affect your filters.
Contaminating your filters with any type of liquid, causing it to become moist will drastically lower the effectiveness, thus endangering employees. Ensure the air you use to clean your filters is dry and clean; otherwise, you'll only spoil your filters and make them worse for wear.
Broken seals and leaking gaskets
Because of how fine the dust is and the nature of gasses, you need to ensure your extractor's seals and gaskets are up to par and can contain all material. Worn-out seals will allow fine particulate matter to escape, nullifying the effects of the extractor. Broken seals and gaskets can also cause your extractor to use more power to do a less efficient job, compensating for the decrease in airflow efficiency.
This not only increases the danger to your staff members, but also puts a strain on the electrical system, as the machine needs to draw more power. Regularly inspect your equipment's seals and gaskets to preempt any mechanical failings; letting your filtration system leak for too long can quietly affect your employees without them realizing the danger of their work.
Check on the extractor's motor
The core of your extractor is the motor; if that fails, there won't be any power to suction the dust and fumes. The motor's job is to facilitate the vacuum effect, as well as cooling the system with the use of cooling holes. Any blockages to these cooling holes can result in the system overheating, leading to unnecessary wear and tear and breakdowns.
One of the most common symptoms of a clogged motor is noticeable vibrations and strange noises coming from the motor's compartment. These signs indicate that there is some sort of blockage preventing the motor from functioning unimpeded. Be on the lookout for these signs; noticing them early and fixing them immediately will prevent more extensive damage.
Step-by-Step Guide to Positioning a Fume Extraction Arm
Assess the workspace
Begin by evaluating the area where the fume extraction arm will be installed. Consider factors such as the location of workstations, the type of tasks performed, and the overall layout of the space.
Install the extraction arm
Follow the manufacturer's instructions for installing the extraction arm. Ensure that it is securely mounted and that all joints and connections are tight. Proper installation is essential for the arm's stability and functionality.
Choose the right extraction arm
Selecting the appropriate fume extraction arm for your specific needs is crucial. Factors to consider include the arm's reach, flexibility, and capacity to handle the volume of fumes produced. An arm that is too short or inflexible may not effectively capture fumes, while an oversized arm can be cumbersome and inefficient.
Position the hood correctly
The hood of the extraction arm should be positioned as close to the source of fumes as possible without obstructing the work. Ideally, the hood should be placed 6–12 inches from the fume source.
How the Fume Extraction Arms Works
Fume extractor arms, also known as capture arms and fume arms, involve the removal of hazardous fumes, vapors, and particulates generated during industrial processes. These fumes can be harmful to human health and the environment, so it is important to extract and properly dispose of them.
In order to exhaust these fumes effectively, fume extractor arms must be able to be positioned close to the source of the contaminants. Fume extraction arms typically consist of a flexible hose or a jointed arm connected to a fan or blower that generates a vacuum. The flexible hose or jointed arm is designed to be highly maneuverable and can be positioned close to the source of the fumes. When the fan is powered on, the vacuum draws the fumes away from the source and into a filter system where the contaminants are captured and contained. Alternatively, the air can be directly exhausted out of the building instead of being filtered and recirculated.
The fan or blower is typically powered by an electric motor and is controlled by a switch or a variable speed controller. For fume extractor arms to work properly, the velocity of the air must be fast enough at the point of capture to ensure proper extraction. The farther away the extractor arm is placed from the source, the greater the volume of air that must be extracted to maintain healthy air quality.
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