API 570 Quiz (ASME 31.3 – Quality Factor of Weld-joint and Casting)
In this very first and priority topic, we will try one by one of the Open/Close questions on Module ASME 31.3 – Quality Factor as a part of in-the-exam API 570 Body of knowledge (BOK) If you don’t know how API 570 Certification scheme, … Continue reading API 570 Quiz (ASME 31.3 – Quality Factor of Weld-joint and Casting)
API 570 Certification Instructions
Certified API 570 Piping Inspectors (Salary rate 350-500usd/day) must have a broad knowledge base relating to maintenance, inspection, repair, and alteration of pressure vessels. The API 570 examination is designed to determine if individuals have such knowledge. To help you learn … Continue reading API 570 Certification Instructions
Guide for selecting Gasket type
The Factors to consider when selecting a gasket Operating temperature and pressure, pipe size, temperature cycle, cost, chemical composition of fluid, fire resistance, radiation, etc In general of application, please use Pressure – Temperature chart as below for understanding the capability of each type of gasket. Sheet Gasket (Rubber gasket, Non-asbestos gasket, PTFE gasket, flexible graphite gasket) Rubber gasket is common with black color, but it is different. Compressed Synthetic Fiber Gasket (e.g. non asbestos or asbestos free) PTFE (Poly Tetra Flour Ethylene) Gasket Type: Virgin(Pure), Filled (Compressed Synthetic), Micro-cellular (Closed or Expanded), with thin metal reinforcement. Flexible Graphite Gasket … Continue reading Guide for selecting Gasket type
HDPE Piping (Theory, Features, Heat Fusion, etc.)
1. What is HDPE? High Density Polyethylene Synthetic resin prepared by polymerizing ethylene One of the general-purpose plastics used a lot in everyday life 2. Features and Application 1) Features: excellent weather resistance, environmental stress cracking resistance, water pressure resistance and workability. 2) Use: General sewer pipe (firefighters in domestic apartments, etc.-screw-in, plant UG-Heat Fusion) ※ Weather resistance: Withstands various climates. Difficulty rusting. ※ Environmental Stress Cracking Resistance 3. Heat Fusion Construction: Fusion Weld Machine = HDPE Welding Machine-Electrofusion Machine, etc. Each company has a different name but the principle is similar. If the machine is installed according to the procedure, it will … Continue reading HDPE Piping (Theory, Features, Heat Fusion, etc.)
BGAS-CSWIP Questions and Answers
Introduction BGAS-CSWIP certification is aimed primarily at pipeline personnel with a focus on established subjects such as welding and NDT inspection. However, it also includes topics such as painting, coating, and agricultural and environmental matters, meaning that there is a … Continue reading BGAS-CSWIP Questions and Answers
What is Chill Plate in Welding
In general, butt joint welding is divided into two-sided welding welded on both sides and the back gouging must be applied due to poor welding quality at the first welding layer of the first one-sided welding. (Call completed joint penetration, See What is CJP in welding) For one-side welding method, a backing material, which is a backing material that prevents melting of molten metal, is attached to the backside of the base material, and then the welding wire is lowered to form an arc between the base material to weld the base material. Welded Chill Plate (or Permanent backing strip, … Continue reading What is Chill Plate in Welding
What is heterogeneous welding
Welded joint in which the weld metal and parent material have significant differences in mechanical properties and/or chemical composition. Example: A repair weld of a cast iron item performed with a nickel-based electrode. Heterogeneous welding is one way of performing fusion welding with the application of external filler whose metallurgical composition is substantially different from that of the base metals. So if filler material is applied during joining and the metallurgical composition of filler is different from that of the base metal then it is termed as heterogeneous welding. It is to be noted that heterogeneous welding is not a … Continue reading What is heterogeneous welding
What is Autogenous Welding
Autogenous welding is one way of performing fusion welding without the application of external filler material. It is to be noted that autogenous welding is not a particular type of welding process like MMAW, TIG, GMAW, etc.; instead, it is one of the three different ways or modes of doing fusion welding. Note that solid state welding processes are usually autogenous as they don’t use any filler during welding. Tungsten Inter Gas (TIG) and oxy-fuel welding processes can be performed in autogenous mode/way. Various advanced welding processes, such as Plasma Arc Welding (PAW), Laser Beam Welding (LBW), Electron Beam Welding … Continue reading What is Autogenous Welding
Typical welding deposition rate
When welding using a fusion process, the edges of a component are melted together to form weld metal. Table: Heat source, mode of shielding, thickness range and metal deposition rates for various fusion processes Process Heat source Shield Parent metal thickness mm Deposition rate kg/hr Arc MMA Arc Gas/flux 1-100 1-4 MIG Arc Gas 0.5-100 1-8 TIG Arc Gas 0.1-100 1-4 SAW Arc Flux 5-250 5-20 ES/EG Resistance/arc Flux/gas 5-250 5-20 Stud Arc – 4-20 – Gas Oxyfuel Flame Gas 0.6-10 1-2 Power beam Laser Radiation Gas 0.2-25 – EB Electrons Vacuum 0.2-250 – Resistance Spot/Seam Resistance – 0.2-10 – Thermit Thermit Chemical … Continue reading Typical welding deposition rate
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