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.
In this article I have discussed in some detail the subject of welding positions. The entire discussion has been done in reference to the Section IX of ASME Boiler and Pressure Vessel Code (BPVC). I have been a welding engineer for more than nine years. One question that has always troubled me about the welding … Read more
Weld symbols and welding symbols are a means of communication between the designer and the welder. Therefore there must be a set of rules regarding representation of information on a welding drawing that must convey same information regardless of who reads it. This article discusses various aspects related to weld symbols and welding symbols. The … Read more
The terms welds and joints are not synonymous. The different types of welds are groove weld, fillet weld, seam weld, flash weld, plug weld, upset weld, spot weld, surfacing weld, etc. These are not joints, but welds. The types of joints are only five, as we shall see in this article. In order to describe … Read more
Warpage in welding and residual stresses occurring in welds are a nuisance for any welding engineer. The distortion spoils the aesthetic appeal of the product, and affects its usability for the intended purpose. Residual stresses can give rise to initiation of fracture in the metal, which can result in catastrophic failure. Therefore, it is important … Read more
Multipass welding is typically required when thick sections are required to be welded. This technique is used in the industry for joining of thick sections, carrying out repairs, build ups, surface hard-facing and so on. As the name suggests, multipass welds consist of multiple passes of welding in a joint. One pass of the weld is generally … Read more
The corner joint welding is used to join two members that are located at approximately right angle to each other in the form of a ‘L’. It is an easy to assemble joint, the edge-preparation for this joint is quite uncomplicated, and it can be used to produce joints in thin as well as thick … Read more
It is important to know different types of joints in welding, so that one can choose the right kind of joint for an application. In this article, we shall see in detail about ‘T’ joint welding, the kinds of edge preparation in welding of such joints, and some of the difficulties associated in welding of tee joints. … Read more
Metal tests enable us to identify metals for welding. Any welding procedure must take into account the chemical composition and mechanical properties of the base metal. Metal tests enable us to identify a metal, and establish its properties. When the behaviour of metal is known, then a compatible filler metal can be chosen, and the … Read more
In most arc welding processes, gases evolve during the arcing operation. These gases should be let out to atmosphere through adequate ventilation. Special attention must be paid when welding in confined spaces. A high concentration of these gases is harmful for the health. A high concentration reduces the oxygen available for breathing for the operator … Read more
Welding stresses are an unavoidable feature of any welding. Stresses inside a weldment may result in many undesirable consequences such as distortion, buckling, warping, lamellar tearing, cracking, brittle fracture, fatigue fracture etc. When weld metal is added to a joint, it is akin to cast metal. When the weld metal cools, it contracts. This is … Read more