Basics of Welding from Logos Weld

Just like any work of art, welding too requires a thorough knowledge of the basics in order to master its different processes. Here is a simplistic understanding about welding and related topics from Logos Weld Products - one of the leading Weldingrod manufacturing plants in India.

To begin with welding is the process through which materials are joined together to form a firm joint. Usually metals or thermoplastics are used in this process. What makes welding different from the other metal joining techniques like brazing and soldering, is the fact that when two metals are joined together in this process, a decent amount of 'melting' of the metals takes place.

Some of the best welding methods are:

1. Shielded Metal Arc Welding
2. Gas Metal Arc Welding
3. Flux-Cored Arc Welding
4. Submerged Arc Welding

Shielded metal arc welding uses an electrode which has the flux around it. This flux is the protectant for the puddle around the electrode. The electrode holder on the other hand holds the electrode as it melts away in the welding process. The slag on the other hand protects the weld puddle from atmospheric contamination of any kind. Gas Metal Arc Welding on the other hand uses a wire feeding gun. This wire feeding gun feeds the wire at an adjustable speed and flows an inert gas (Argon gas) or a mix of carbon dioxide and Argon over the weld puddle to protect it from atmospheric contamination.

Flux-Cored Arc Welding is quite similar to Gas metal arc welding. The only exception is that this method of welding uses a special tubular wire filled with flux. Depending on the filler, you can either use or not use the tubular wire. While the Submerged Arc Welding makes use of an automatic fed consumable electrode along with a blanket of granular fusible flux. In this method of welding the molten weld and the arc zone are constantly protected from the atmospheric contamination as it is “submerged” under the flux blanket.

These are some of the basic ways in which welding can be done. 

For better understanding about the various kinds of welding and other Logos Weld products visit www.logosweld.com.

Logos Weld with their state-of-art Weldingelectrode machine exporter are the best Weldingelectrode flux exporter in India. 

We are ISO 9001:2008 certified and have been providing quality welding services since 1994.

Different kinds of sieving machines

Sieving is the process through which unwanted elements are removed from the wanted elements. This surely is a very lose way to describe the process of sieving; because many times this technique is also used to separate particles of various shapes and sizes in order to refine the product. Usually a siever has a net or a mesh in order to screen out the unwanted material.

A sieving machine typically consists of two chambers – one in which the waste/ unwanted materials are collected; another which collects the required material. These machines come in various shapes & sizes and are used depending on the industry of work. Based on their shape and size sieves can be broadly of three types:

1. Perforated plate sieves: This type of sieve confirms to the ISO 3310-2 and has a diameter range from 200 to 450 millimeters. The perforated plate sieves have square/ round nominal apertures which ranges from 1 millimeter to 125 millimeters.
2. American standard sieves: They are also known as ASTM sieves, as they conform to the ASTM E11 standard. Unlike the perforated plate sieve, ASTM sieves are available in only 8 and 12 inch diameter sizes. Their nominal aperuture ranges from 20 micrometers to 200 millimeters.
3. Woven wire mesh sieves: One of the most commonly used sieves, woven wire mesh sieves conform with the ISO 3310-1. Their nominal aperture ranges from 20 micrometers to 3.55 millimeters, and when it comes to their size – these sieves diameter ranges from 100 to 450 millimeters.

As has already been mentioned, based on the end-requirement, sieves are selected and brought into use. According to Logos Weld – leading Wire Straightening and Cutting Machines Manufacturer in India – it is important that the size and capacity of the work load should be taken into consideration before investing on any such machines. The other important aspects that needs to be paid attention to are:

• The construction of the sieve

• Its design

• The housing should be non-corrosive in nature

Most of all, the sieve should be easy to maintain

Logos Weld also recommend a sieve analysis test before settling on a sieving machine. A sieve analysis is basically a process through which the gradation or the size of the particles to be separated can be assessed. This test can be performed on organic as well as non-organic materials. Usually this process is quite widely used in the area of civil engineering. But those belonging to other industries too can make use of this analysis so that they choose an appropriate siever.

For more information on sieving machines and welding rodmanufacturing plants you can visit www.logosweld.com or call at +91 422 2934784.

Flux-Cored Arc Welding

Welding involves joining different materials together. In the welding process a good amount of 'melting' of the metals takes place while fixing two metals together, andn this is what differentiates it from soldering and brazing. Usually metals or thermoplastics are used in the welding process. Flux-cored arc welding (FCAW) is one of the popular welding processes. It is an automatic or semi-automatic arc procedure. Introduced in the 1950s, this process involves the use of a new kind of wire electrode on an MIG welding machine. This is the reason why flux-cored is regarded as similar to MIG welding process. The equipments used in both the processes are same, so are wire fields and power supply. The wire used in this purpose is the tubular wire and not that the usual solid wire.

Basically there are two types of flux-cored wire:

• Self-shielded

• Dual Shield

While self-shielded wires do not use any external gas shield, rather they employ the flux to shield the molten weld puddle; dual shield wire uses both the external shielding gas as well as the flux to protect the molten weld puddle. Usually carbon dioxide and argon are used as shielding gases in dual shield flux cored wire.

If we compare flux-cored arc with MIG welding process, then it is has greater productivity. While a MIG welder can produces on an average 5 to 8 pounds of weld in an hour, FCAW produces above 25 pounds of weld per hour. Along with higher productivity, flux-core welding can weld 1/2” plates at a time that too on both the sides with full penetration. This is the precise reason why this welding process is used in the ship building industry which requires high quality welds which are not time consuming and can work even in windy conditions. It is also used in construction industry due to its speed and portability.

Advantages of Flux-cored arc welding

• This welding process involves minimal weld clean up

• It requires lower heat inputs.

• The electrode efficiency is extremely high.

• No external shielding gas is required.

• Reduced welding fumes.

Disadvantages of Flux-cored arc welding

• It is recommended for heavy material only. Thus cannot be used for thin materials.

• Lot of smoke is generated in the whole process.

• Produces a lot of slag.

• The cost of the equipment is extremely high.

For more information on welding and weldingelectrode making machine, you can visit http://www.logosweld.com/Contact-us.html or call at +91 422 2934784.

Logos Weld with their state-of-art weldingrod manufacturing plant are the best WireStraightening and Cutting Machines Manufacturer. They hold ISO 9001:2008 certification and have been providing quality welding services since 1994.