The Marangoni effect is the mass transfer along an interface between two fluids due to the surface tension gradient (which fluid from areas with low surface tension is transferred to areas with higher surface tension). In particular, a negative value … Continue reading What is Marangoni effect in GTAW 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
Welding fabrication involves several operations which might have a significant ergonomic impact.This article aimed at providing an overview on these typical activities, and the most confusion on terminology of Partly Mechanized and Fully Mechanized processes during identify the welding personnel as a WELDER or WELDING OPERATOR? The role of welding personnel in welding processes: Based on the level of automation, processes are defined by applicable industrial standards as:– Manual processes, involving welders;– Partly mechanized (or semiautomatic) processes, involving welders;– Fully mechanized (or automatic) processes, involving welding operators;– Automatic and/or robotized processes, involving welding programmers, operators.Depending on the industrial needs, some … Continue reading What is different between Partly mechanized and Fully mechanized welding process?
Tension Test Acceptance Criteria for Welding Procedure Qualification per ASME IX; To qualify the welding procedure according to the ASME Section IX, the mechanical properties of the test coupon must be tested. Tension Test, which is the test of the strength of the weld by The principle of ASME is that Weld Metal must be stronger than or equal to the strength of Base Metal. Therefore, the result of the Tension Test will have Acceptance Criteria as follows. The workpiece is torn/break at Base Metal: Ultimate Tensile Strength (UTS) or Failure Stress of the workpiece must be greater than 95% … Continue reading Tension Test Acceptance Criteria for Welding Procedure Qualification
Welding Defects – Lamellar Tearing; Lamellar Tear is a crack that is a step in the base metal under the welding line. The cracks lie parallel to the work surface, especially with the Rolled Steel Plate. Lamellar Tear is caused by Tensile Stress in Through-Thickness direction. This comes from the shrinkage of the weld and the base metal itself has impurities or inclusions that are parallel to the work surface Thus causing a tear or crack Lamellar Tearing up. Continue reading What is Lamellar tearing
A simple quick cross check which standard is require for each specific item in welding. Free download full table of Standards: EN ISO welding standards summary 2013 Continue reading EN ISO welding standards summary
The free pdf file of Thirty-four (34) Module 5 Q&A model of 2000 version: Module 5 AWS CWI QUESTIONS ANSWERS (pdf) DOWNLOAD The Below Eight (08) Questions are model of 2018 version Module 12: Inspection Reports Q12-1 Once inspections … Continue reading AWS CWI Questions and Answers (Module 12)
The free pdf file of Thirty-one (31) Module 10 Q&A model of 2000 version: Module 10 AWS CWI QUESTIONS ANSWERS (pdf) DOWNLOAD The Below Fourty-four (44) Questions are model of 2018 version Module 11: NDT and Visual inspection Q11-1 … Continue reading AWS CWI Questions and Answers (Module 11)
The free pdf file of Nineteen (19) Module 9 Q&A model of 2000 version: Module 9 AWS CWI QUESTIONS ANSWERS (pdf) DOWNLOAD The Below Twenty (20) Questions are model of 2018 version Module 10: Welding Discontinuities Q10-1 A discontinuity … Continue reading AWS CWI Questions and Answers (Module 10)