This category contains information on some basics about welding such as types of joints, welding safety, welding terms and definitions, and some fundamentals of welding in general.
Failure of a weld can have serious consequences. A weld failure in the backyard of house may not have much consequences. However, when the weld lies in a large sized pressure retaining equipment, weld failure can cost heavily on life and equipment. Such failures have to be analysed by an expert or a team of … Read more
The mechanical properties of a metal determine its’ suitability for an application. The properties help in predicting the behaviour of metals under certain conditions. The knowledge about properties of a metal also helps in specifying the requirements during procurement of raw materials for fabrication of equipment. From a welding point of view, quantifying the behaviour … Read more
In order to understand about the polarity in an arc welding circuit, it is first important to understand the construction of the arc welding circuit. This article discusses a few terms used in any electrical circuit such as EMF, current, and resistance. The later part of the article equates the welding electrical circuit to ordinary … Read more
In welding, butt joints are used to join the edges of two plates or surfaces located in approximately the same plane. Butt joint is the most commonly used in the industry among all joint types. The following figure shows plain square butt joints of various thicknesses. As can be seen, there is no beveling of the two parts in … Read more
In welding – besides the current current power source, the second type of power source is the constant voltage (CV) machine or the constant potential (CP) machine. It has a relatively flat volt-ampere characteristic curve. In this article we shall discuss about arc welding with constant voltage. Features Of A Constant Voltage Machine The figure below shows … Read more
The power source is the most important part of the arc welding equipment. In all arc welding processes, two kinds of power sources are generally used, from a voltage-ampere output characteristics point of view. One is constant current type, the second is constant voltage type. This article details the constant current type power sources in … Read more
The term arc welding is a very broad term that includes a wide variety of welding processes, that can all be grouped under this one term. As the name indicates, in arc welding – the heat of an electric arc is utilized to melt the base metal and obtain coalescence. The electric arc has a … Read more
This article describes a few aspects of forehand welding and backhand welding in oxyfuel welding process. Before we get into the specifies, let us understand a few related terms, such as work angle, push angle, travel angle, etc. Work Angle For a butt weld between two plates, imagine a plane cutting the base plates perpendicularly. … Read more
This article discusses in brief about expansion and shrinkage in welding, its effects, and remedies. Welding invariably involves heat. We know that metal expands when heated, and contracts when cooled. When molten metal is added to the joint, some of the sidewalls also get melted and get fused with the freshly deposited weld metal. This … Read more
Multilayer welding, as the name suggests, is the name given to welds which are made by using multiple layers of weld. Using multiple layers becomes necessary when welding of thick sections is being done. High thickness base metals cannot be welded with a single pass, as the resulting bead would be too big, unwieldy, and … Read more