Understanding The ASME Standards

ASME (American Society of Mechanical Engineers) is technological association that maintains standardization of equipments for the industries of processing & mining, which involves with items like pressure vessel, boiler and inspection piping. The role of the society is to maintain checks and balances for industrial inspection by the help of volunteer engineers, which are entitled to monitor about predefined aspects of standard for manufacturers and operators operating those mechanical equipments in machining shop. Manufacturers tend to acquire ASME U-Stamp certification, so they could reveal to their consumers about the maintenance of standards while using modern equipment, and they can acquire their services without any hassle. Moreover, it further reflects that firm endows a healthy reputation among industry wide professionals, and certification has bound the company to adopt standards of optimal safety in the production of their products or services.

The certification of ASME U-Stamp also assures that manufacturing company is using pressure vessels and boilers in the synthesis of industrial process are not threat to life. Such kind of industrial apparatus contains excessive pressure & elemental wear and tear, so their usage needs to adopt those standards and protocols of certification, useful in reducing the aspect of malfunction & optimization of productive efficiency of equipment. The welding or other technical equipments that use pressure vessels and machinery must be capable of regular refurbishments, repairs and parts replaceable.

Maintenance Of Quality Assurance:
To achieve optimal operation of welding, there is more than one factor that supervises the whole process from preliminary point to production of product. To get into the listing of certified welding shops, the two levels i.e. machine operation refurbishment and repair must be adopted for future mechanical upgradation of apparatus, so manufacturers or retailers of such an equipment caters to include reusability factor in the machinery. For that sake, pressure vessel manufacturer as well as engineering board of ASME U-Stamp certification inspects the equipment for optimal output.

Generally, physical magnitudes of industrial equipment aren’t small, the large welding machineries comprise of small components which need to be refurbished during different phases of production. Having engineered at component level enables these machines to undergo raw and hard materials in rough condition. The process of excavation and production demands different mechanisms, capacities and orientations. The mechanical operation of these large machines may get damaged during completion of required processes, so machining and repair at component level becomes more easy. Concisely, certification benchmarks ASME U Stamp companies for optimal function of equipment involved in the industrial synthesis.

The achievement of ASME U-Stamp Certification doesn’t involve complex procedure, the inspection to monitor about standards is conducted by respective field experts. The professionals and engineers constituting this association, utilize their skills to prove durability and capability in technology related industrial processes involved in machining shop. Maintaining these procedures for machinery ensures continuity in production and optimal return of investment for the costs along with safety measures for workers.

Oxy-Fuel Welding (OFW)

Oxy Fuel Welding (OFW) is a metal joining process, used to join metal end pieces by heating. This process is commonly used to join mild steel. Oxy-Fuel welding is also called oxyacetylene welding because in this process mixture of acetylene and oxygen burns at intense flame of 3500^oC. Oxyacetylene gas welding consists of a group of welding processes, which joins different type of metals by heating them whether it is used with gas flame or without filler metal. When the gas flame combined with metal, it melts the surface to molten form, by allowing the welding process to take place. Oxy-Fuel welding can be used for shaping metal, cutting and brazing of metals. Oxy-fuel welding is mostly used for prefabrication of tubes, steel sheets and plates.

Oxy-FuelWelding process includes welding operations that make use of oxygen, which can also be combined with fuel gas as a heating medium. In this process, gas, fuel and oxygen are mixed in a mixing chamber with proper proportion that also a part of the welding assembly. This welding process involves a filler metal and the melting of the base metal, which can be used by means of the flame produced at the tip of welding torch.

Oxy-Fuel Welding Processes

There are following three processes that involves in Oxy-Fuel Welding.

• Oxy-acetylene welding
• Oxy-hydrogen welding,
• Pressure gas welding.

Oxy Fuel welding also known as air acetylene welding because of its industrial significance, in which combustion of air and acetylene heat is obtained. Welding with Methyl acetone- propadiene gas (MAPP gas) also uses same procedure like Oxy-fuel welding.

Advantages of OFW

There are following given advantages of oxy Fuel welding:

• A welder can control temperature of weld zone, heat input and the oxidizing or reducing potential of the welding environment that controls the welding process.
• Welding process also controls the shape, weld bead size and weld puddle viscosity as it independently adds a filler metal of the welding heat source.
• Oxy Fuel Welding is used for welding of tubes, thin sheets and small diameter of pipe.
• OFW is also used to repair welding joints, welds of thick sections. However, its repair work is not very economical, so its use is not feasible at commercial level.

Oxy fuel welding process is used in welding shops, it is mostly used for torch brazing, soldering, and many other types of operations, where its heat transfer rates and flame characteristics are not the same like that of welding.

Shielded Metal Arc Welding (SMAW)

SMAW is a process of welding that uses a fragile electrode coated in flux. SMAW have many names this process is also known as stick welding, Manual Arc Welding or flux shielded arc welding. In SMAW process as the weld is laid, the external coating of flux on electrode disintegrates, providing a layer of slag and a shielding gas. These elements protect the weld area from infectivity until the area cools. The external flux coating also performs more functions such as it provides control bead shape or arc stability.

Equipment & Operation for SMAW

The following equipment and operations are necessary for SMAW process.

• Welding power source
•  Electrode holder
• Ground clamp
• Welding cables and connectors
• Accessory equipment (It includes wire brush, chipping hammer)
• Protective equipment (It includes gloves, helmet etc.)

Welding Power Sources

Shielded Metal Arc Welding circuit we can use either Direct Current (DC) or either Alternating Current. In some specific cases, the power source must use constant current type. In this type, power source will deliver relative welding current or constant amperage. As it will remains constant so the weld beads which are produced will be uniform in shape and size.

Electrode Holder

The use of electrode holder is to connect different welding cables and ducts to the electrode. Electrode holder is available in different sizes and capacities. The purpose of insulated handle is to guide electrode over the weld joints.

Ground Clamp

The purpose of the ground clamp is to connect the ground cable to the work piece. A good ground clamp having the characteristics of carrying more electric current without overheating.

Welding cables and connectors

Electrode cable and ground cable plays an important role in the SMAW circuit. So different welding cables and connectors are also necessary components for the SMAW circuit.

Coated Electrodes

In Shielded Metal Arc Welding various types of coated electrodes are used. For different types of welding specific electrodes are used according to their types. For example, electrodes used for low allows and stainless steels will quite different from the coated electrodes which are used for mild or carbon steel.

For information about the Fabrication or welding you can also visit http://millenniumind.com/

Welding Repair

Weld repair is a process in which remove the damages of a metal. Metal damages removes from the use of Oxy fuel welding and by using carbon arc gouging or plasma cutting. For a good metal weld repair we must follow the steps which are involves in weld repair process.

Welding Procedure

For the use of welders a logical procedure of welding is to be applicable. In this procedure use special metal fillers and preheat the metal. In most of the construction companies, we can successfully weld a steel metal by using the following three steps which are:

•  In first step, Cutting the metal into the parts and removed the defected Components.
• In second step, prepare the new metal weld joints
• In third step, welding and cleaning the metal.

Step 1: Cutting metal into the parts and removed the defected components.

In the first step of welding repair removes the damages of a metal. This step can complete with the use of different welding techniques. Plasma and oxy-fuel are used for cutting a metal. We can also use carbon arc gouging which is well suited for removes the cracks from metal without harming the other parts of a metal.

With the help of different tools we can repair a metal. One of the most commonly used for cutting a metal is Oxy-fuel torch. Another tool which is used for cutting a metal is plasma cutters. By using plasma cutters welders can cut small parts width of metals. Plasma cutters are faster than the Oxy-fuel torches because by using plasma cutter welders can also cut electrical conductive metals but with the use of oxy-fuel torch welders can’t cut the stainless steel or aluminum metals. One of the most other common tools is carbon arc gouging which is used for welding generators. In using a carbon arc gouging uses an electrode which is made up of a carbon. By using this electrode welder can remove the defected parts. In result high pressure stream of air will released.

Step 2: prepare the new metal weld joints.

In the second step, welder will choose the filler material and replace all the parts with selected material which is better and have more power strength of the previous original material. According to their different mechanical properties such as tensile strength, wear resistance and ductility etc they have different applications. For avoiding long term failure of welding must ensure the quality and remove the unwanted downtime defects. When you will choose the right alloy then cut the steel and bevel the edges. After this preheating is required this is to be done by the use of oxy fuel torch.

Step 3: Welding and cleaning the metal.

In the third and last process, welders choose the welding process which they will follow to weld a metal. There are two most commonly used processes are:

•            Shielded Metal Arc Welding (SMAW)
•            Flux Cored Arc Welding (FCAW).

This article is all about the welding repair process. Millenniumind industry will offer the all these services.

For more details you can also visit at http://millenniumind.com