Category Archives: Mechanical Engineering

Arc Efficiency (welding)

The welding arc provides the intense heat needed to locally melt the workpiece and the filler metal. In fact, all the electrical energy supplied by the power source is converted into heat (current x voltage). Some energy is lost in the electrical leads, and therefore the energy available for welding is the product of the… Read More »

The Welding Arc

Most metals and alloys conduct electricity at room temperature due to the presence of free electrons. A considerable amount of heat can be produced from the flow of the current in a circuit. Typical examples of this heating effect, also called resistance heating, are tungsten filament bulbs and heating coils in ovens. In comparison, gases… Read More »

Grouping of Welding Processes

There are many ways in which welding processes may be grouped and different countries have adopted various classification schemes based on the application of heat, whether external pressure is applied, the type of energy involved (mechanical, electrothermic, thermochemical), etc. The American Welding Society (AWS) groups welding processes based primarily on the mode of energy transfer,… Read More »

What Is a Fluid?

What Is a Fluid? You will recall from physics that a substance exists in three primary phases: solid. liquid, and gas. (At very high temperatures. it also exists as plasma.) A substance in the liquid or gas phase is referred to as a fluid. Distinction between a solid and a fluid is made on the… Read More »


Manufacturing basically implies making of goods or articles and providing services to meet the needs of mankind. It creates value by useful application of physical and mental-labor in the process. It is a chain of interrelated activities of production process and other support services activities of an manufacturing environment such as order processing, product design,… Read More »


The choice of production type dictates the machine requirements, organizational system to a large extent, layout planning and inventory subsystems. Three main types of production are job, batch and flow or process production. The simplest way is to classify based on production and processes by lot size, namely single unit production, small lot production, moderate… Read More »


The computer aided manufacturing implies manufacturing itself, aided or controlled by computers. In a wider sense, it denotes all the activities in the manufacturing environment like use of computers in inventory control, project management, material requirement planning, data acquisition, testing and quality control. Improved reliability in view of the better manufacturing methods and controls at… Read More »


Mechanization means something is done or operated by machinery and not by hand. Mechanization of the manufacturing means is milestone oriented trend towards minimizing the human efforts to the extent of its possibility, by adopting mechanical and electrical means or methods for automating the different manufacturing processes. Such a trend may be in the area… Read More »


A product is manufactured to perform desired functions. It must have a specified dimension such as length, width, height, diameter and surface smoothness to perform or accomplish its intended function. It means that each product requires a defined size, shape and other characteristics as per the design specifications. For manufacturing the product to the specified… Read More »


The technique of simplification and standardization of product is closely inter-related that leads to higher efficiency in production, better quality and reduced production cost. Simplification is a process of determining limited number of grades, types and sizes of a components or products or parts in order to achieve better quality control, minimize waste, simplify production… Read More »