SHOT BLASTING SERVICE
We provide a high quality shot blast cleaning service. This can be designed and tailored to suit a whole range of shot blasting applications, whether industrial or commercial.
It does not matter if your project is a small metal object or a large industrial building complex, we have the right people and the right equipment to supply you with the highest possible shot blasting service available.
Shot blasting is used to prime and clean surfaces, removing rust, scale or old coatings to expose clean bare metal ready for subsequent treatment. It also provides an effective method of preparing a surface with a roughened profile which promotes the adhesion of the specialist coatings we offer.
We are equipped to shot blast using a variety of media including; metal shot or ball, aluminium oxide, silicon granules and glass. These are specified to offer a wide range of surface conditions which optimise the performance of the finished deposit. For larger components and assemblies it can offer substantial speed and cost savings over other conventional cleaning methods.
Shot Blasting is the operation of propelling pressured abrasive media against a surface to remove the coating from the material and is a versatile method of abrasive blast cleaning suitable on a wide range of materials.
Whether you have a metal, concrete, brick or wood structure in need of preparation prior to painting or just in need of cleaning, shot blasting is an effective solution for both time and cost. With various services on offer, we will work with you and to your budget to help you get what you want.
Key Properties of shot blasting
- Surface Cleaning – De-rusting / De-Scale
- Surface Preparation – Prior to Coating
Steel shot blasting is a high quality abrasive for a whole range of different things, it is a resistant method which means that it has optimum cleaning efficiency and can really breathe life into old steel products and structures.
Ideal for steel and other ferrous metals, shot blasting can be used to prepare a surface for painting or coating depending on it’s function. Our team have extensive training from Hodge Clemco which allows them to deliver safe, first class service regardless of the size of the project.
To supplement this service, we also offer priming, painting and stone/brick sealing in order to protect your surface post-blasting. We have over 30 years of experience so you can rely on us to clean away dirt and level surfaces.
Shot Blasting is a process used to prepare the component surface prior to coating or application of overlays. The method includes directing at a high speed spherical blasting media, through compressed air, against the component surface to clean, remove corrosion, mill scale, paint or rust, achieve a smooth finish, polish and strengthen (Peening) the metal.
Blasting results can be manipulated by length of exposure to blasting, when in a tumbler, or adjustment of pressure, nozzle size and nozzle distance when in a cabinet or Shot Blasting room.
Shot Blasting cleaning and quality standards
New coatings will not adhere on component’s surface if the surface has not been prepared properly, by removing the rust or the mill scale. Rectifying the failure of coating can be expensive and time consuming, as it implies removing the coating, prepare the surface finish, re-coating and in some cases the component might need to be dismantled and assembled.
Our service can achieve the desired Sa standards to ensure that the part’s surface is cleaned to the specification. This ensures the metal is prepared for the coating stage avoiding any future failures.
- Light blast cleaning
- Thorough blast cleaning
- Very thorough blast cleaning
- Blast cleaning to visual clean steel
Shot blasting is used in almost every industry, being a highly efficient preparation for nearly all metal items including aerospace, automotive, construction, foundry, ship building, rail, I-beams, angles, pipes, tubes and large fabricated pieces. This method can be applied on metals and softer materials such as plastics and wood. The process can also provide decorative finishes.
Surface affects of blasting
- Bright matte finish
- Dull matte finish
- Satin finish
- Satin lustre finish
- Blending of tool marks
- Removal of weld discoloration
- Surface cleaning
- Glass frosting and etching
- Pre plate and anodize finish
- Paint and coating removal
- Pre paint and coating adhesion
- Heat treat, mill scale removal
- Weld splatter removal
- Thermal metal spray prep
- Rust removal
- Mold cleaning
There are various applications of shot blasting, depending on the surface and required finish.
Sand blasting is also known as bead blasting and abrasive blasting, which is a generic term for the process of smoothing, shaping and cleaning a hard surface by forcing solid particles across that surface at high speeds; the effect is similar to that of using sandpaper, but provides a more even finish with no problems at corners or crannies. Sandblasting can occur naturally, usually as a result of particles blown by wind causing aeolian erosion, or artificially, using compressed air.
Sandblasting equipment typically consists of a chamber in which sand and air are mixed. The mixture travels through a hand-held nozzle to direct the particles toward the surface or work piece. Nozzles come in a variety of shapes, sizes, and materials. Boron carbide is a popular material for nozzles because it resists abrasive wear well.
Wet abrasive blasting
Advantages include the ability to use extremely fine or coarse media with densities ranging from plastic to steel and the ability to use hot water and soap to allow simultaneous degreasing and blasting. The reduction in dust also makes it safer to use silicacious materials for blasting, or to remove hazardous material such as asbestos, radioactive or poisonous products.
Process speeds are generally not as fast as conventional dry abrasive blasting when using the equivalent size and type of media, in part because the presence of water between the media and the substrate being processed creates a lubricating cushion that can protect both the surface and the media, reducing breakdown rates. Reduced impregnation of blasting material into the surface, dust reduction and the elimination of static cling can result in a very clean surface. However wet blasting of mild steel will result in immediate or ‘flash’ corrosion of the blasted steel substrate due to the presence of water. The lack of surface re contamination also allows the use of single equipment for multiple blasting operations—e.g., stainless steel and mild steel items can be processed in the same equipment with the same media without problems.
Bead blasting is the process of removing surface deposits by applying fine glass beads at a high pressure without damaging the surface. It is used to clean calcium deposits from pool tiles or any other surfaces, remove embedded fungus, and brighten grout colour. It is also used in auto body work to remove paint. In removing paint for auto body work, bead blasting is preferred over sand blasting, as sand blasting tends to create a greater surface profile than bead blasting. Bead blasting is often used in creating a uniform surface finish on machined parts. It is additionally used in cleaning mineral specimens, most of which have a Mohs hardness of 7 or less and would thus be damaged by sand.
In wheel blasting, a spinning wheel propels the abrasive against an object. It is typically categorised as an airless blasting operation because there is no propellant (gas or liquid) used. A wheel machine is a high-power, high-efficiency blasting operation with recyclable abrasive (typically steel or stainless steel shot, cut wire, grit, or similarly sized pellets). Specialised wheel blast machines propel plastic abrasive in a cryogenic chamber, and is usually used for deflashing plastic and rubber components. The size of the wheel blast machine, and the number and power of the wheels vary considerably depending on the parts to be blasted as well as on the expected result and efficiency.
Hydro blasting is not a form of abrasive blasting as no abrasive media is used. Hydro-blasting, commonly known as water blasting, is commonly used because it usually requires only one operator. In hydro-blasting, a highly pressured stream of water is used to remove old paint, chemicals, or buildup without damaging the original surface. This method is ideal for cleaning internal and external surfaces because the operator is generally able to send the stream of water into places that are difficult to reach using other methods. Another benefit of hydro-blasting is the ability to recapture and reuse the water, reducing waste and mitigating environmental impact.
Micro-abrasive blasting is dry abrasive blasting process that uses small nozzles (typically 0.25 mm to 1.5 mm diameter) to deliver a fine stream of abrasive accurately to a small part or a small area on a larger part. Generally the area to be blasted is from about 1 mm2 to only a few cm2 at most. Also known as pencil blasting, the fine jet of abrasive is accurate enough to write directly on glass and delicate enough to cut a pattern in an eggshell. The abrasive media particle sizes range from 10 micrometres up to about 150 micrometres. Higher pressures are often required.
The most common micro-abrasive blasting systems are commercial bench-mounted units consisting of a power supply and mixer, exhaust hood, nozzle, and gas supply. The nozzle can be hand-held or fixture mounted for automatic operation. Either the nozzle or part can be moved in automatic operation.
Automated blasting is simply the automation of the abrasive blasting process. Automated blasting is frequently just a step in a larger automated procedure, usually involving other surface treatments such as preparation and coating applications. Care is often needed to isolate the blasting chamber from mechanical components that may be subject to dust fouling.
In this type of blasting, air and dry ice are used. Surface contaminants are dislodged by the force of frozen carbon dioxide particles hitting at high velocity, and by slight shrinkage due to freezing which disrupts adhesion bonds. The dry ice sublimates, leaving no residue to clean up other than the removed material. Dry ice is a relatively soft material, so is less destructive to the underlying material than sandblasting.
Bristle blasting, unlike other blasting methods, does not require a separate blast media. The surface is treated by a brush-like rotary tool made of dynamically tuned high-carbon steel wire bristles. Repeated contact with the sharp, rotating bristle tips results in localised impact, rebound, and crater formation, which simultaneously cleans and coarsens the surface.
Vacuum blasting is a method that generates very little dust and spill, as the blast tool does dry abrasive blasting and collects used blast media and loosened particles from the surface to be treated, simultaneously. Blast media consumption is relatively low with this method, as the used blast media is automatically separated from dust and loosened particles, and reused several times.
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