In GTAW (Gas Tungsten Arc Welding) also known as TIG welding (Tungsten Inert Gas welding), a non consumable electrode (made up of Tungsten) is used. Tungsten is preferred due to high its high melting point (approximately 3,4100C) and high hardness. Either pure tungsten is used as electrode or it can be alloyed with other elements. These electrodes come in a variety of sizes and lengths. These electrodes are color coded….
Welding Positions
Plate Welding Positions For plate welding we have four different positions namely; Flat position (1G or 1F) Horizontal Position (2G or 2F) Vertical Position (3G or 3F) Overhead Position (4G or 4F) Note: 1. G Designates groove welding (V-groove, J-groove, U-groove etc.) 2. F Designates fillet welds (“T” – Joint, Lap Joint etc.) FLAT WELDING POSITION (1G OR 1F) In flat welding the welders head….
Types of steel – Classification of steel
Based on the chemical compositions, Steel can be categorized into four basic groups: Carbon Steel Alloy Steel Stainless Steel Tool Steel CARBON STEEL: Carbon steel is the most utilized steel in the industries and accounts for more than 90% of the total steel production. Based on the carbon content, Carbon steels are further classified into three groups. Low Carbon Steel/Mild Steel Medium Carbon Steel High Carbon steel Carbon content….
GMAW (MIG Welding) electrode specification
GMAW (MIG welding) electrodes are designated by some letters and numbers such as ER70S-6, ER90S-6 and E308L etc. I will explain the meaning of these symbols: FOR CARBON STEEL OR MILD STEEL (SUCH AS ER70S-6 OR ER70S-3) Where, ER – Designates electrode or filler rod XX – Designates the minimum tensile strength of the deposited weld metal S – Stands for solid wire Y – Designates the chemical composition of….
Gas Metal Arc Welding (GMAW/MIG)
Gas Metal Arc Welding (GMAW) is also known as Metal Inert Gas Welding (MIG welding). In this process, consumable electrode is used in the form of wire and a shielding gas such as Argon, Helium, Carbon dioxide or a mixture of these gases are used. These gases shield the molten weld pool from atmospheric contamination. The shielding gas is allowed to flow through the weld gun. Electrode of MIG welding….
Shielded Metal Arc Welding (SMAW)
Shielded Metal Arc Welding (SMAW) also known as Manual Metal Arc Welding (MMAW), is a manual arc welding process that uses a consumable electrode (covered with a flux). Electrode is connected with one terminal of the power source and the work is connected with the other terminal of the power source. Welding cable (or lead) is used for this purpose. The power source can be used in AC (alternating current) or DC (Direct current). In….
Welding electrodes – Understanding the SMAW electrode symbols
Shielded Metal Arc Welding (SMAW) electrodes are designated by “E” followed by four (or five) digits for example: E7018, E6013 or E10018. I will explain the meaning of these symbols: IF THE ELECTRODE HAS “E” FOLLOWED BY FOUR DIGITS (FOR EX. E7018) E – Stands for electrode XX – First two digits designates the minimum tensile strength in Ksi (XX * 1000 Psi) X – Second last digit designates position….
Types Of Welding – Classification of welding processes
Welding is a process of permanently joining two or more parts by the application of heat and (or) pressure. As per American Welding Society 50 different welding processes available today; some are very popular among the industries such as SMAW, GMAW, GTAW, SAW, FCAW etc. whereas some are very specific and limited to few industries such as USW, RSW, DW etc. Welding processes are broadly classified as fusion welding and….
Dye Penetrant Test (DPT, LPI, PT) – Non Destructive Test
Dye Penetrant Test (DPT) is also known as Liquid Penetrant Inspection (LPI) or Penetrant Test (PT). It is one of the most widely used Non Destructive Test (NDT) methods. It can be used to inspect almost all non-porous materials such as metals, plastics, ceramics etc. We can detect any surface discontinuity (or flaw) such as surface cracks, porosity, pinholes etc. by this test method. Principle: DPT is based upon a natural….
Welder Qualification Test (Performance Qualification)
Welder Performance qualification (WPQ) is also known as welder qualification test (WQT) or Performance qualification test. Welder qualification test is a very basic and most important step before assigning the job to a welder. The welder qualification test (WQT) is done to determine whether the welder or the welding operator can produce a sound weld or not. Each welder or welding operator shall be qualified for each welding process to….