• Ageing or Precipitation hardeningA low temperature heat treatment designed to produce the correct size and distribution of precipitates, thereby increasing the yield and tensile strength. It is generally preceded by a solution heat treatment. For steel, the temperature may be somewhere between 450-740 degree C, an aluminium alloy would be aged at between 100-200°C. Longer times and/or higher

  • As anyone in the fabricating and welding business knows, process and part inspection is a critical component of a successful business. Build and weld a poor part will simply guarantee failure. Today, welding associations, such as the Canadian Welding Bureau, offer certification courses to help welders learn the ins and outs of proper inspection processes, but before taking the course, you should

  • Many characteristics of a weld can be evaluated during welding inspection - some relating to weld size, and others relating to the presence of weld discontinuities. The size of a weld can be extremely important, as it often relates directly to the weld's strength and performance. For instance, undersized welds may not withstand stresses applied during service. Depending on their size and/or

  • Basic Weld Inspection - Part 2 John Hoh Senior Staff Engineer National Board Category: Design/Fabrication Summary:This article was originally published in the Winter 2010 National BoardBULLETINas the second of a two-part series. This is a continuation of the articleBasic Weld Inspection - Part 1originally published in the Fall 2009 edition of theBULLETIN,

  • Preheating involves heating the base metal, either in its entirety or just the region surrounding the joint, to a specific desired temperature, called the preheat temperature, prior to welding. Heating may be continued during the welding process, but frequently the heat from welding is sufficient to maintain the desired temperature without a continuation of the external heat source. The interpass temperature,

  • While using a torch to preheat your welds may seem simple enough to suit your job, is it doing the job correctly?‚Äč Preparing an electrical resistance preheat on a large piece of machinery. Image courtesy of KASI Technologies Inc. Preheating is an important preparatory operation for certain welding jobs. As the name implies, it is the process of raising

  • Radiographic Testing (RT)is anondestructive examination (NDE)technique that involves the use of either x-rays or gamma rays to view the internal structure of a component. In the petrochemical industry, RT is often used to inspect machinery, such aspressure vesselsand valves, to detect for flaws. RT is also used to inspect weld repairs. Compared to other NDE techniques,

  • Induction Heating The most common methods for achieving a more controlled preheat temperature are induction heating and electrical resistance heating. “The equipment used for induction is considerably more expensive than that used for electrical resistance heating,” said Fong. “However it does get your steel hotter quicker. It still offers you much more control than what you

  • Q: We are expanding our job shop and adding the capability to work with much heavier structures, including considerably thicker materials. Some of these jobs specify high-strength materials and preheating. Some of our welders claim preheating is performed to remove water from the steel. Can you expand on this? A: This is an excellent topic for discussion! Preheating and postweld stress relief are

  • Overview of Hydrostatic Testing Hydrostatic (Hydro) Testingis a process where components such aspipingsystems, gas cylinders, boilers, andpressure vesselsare tested for strength and leaks. Hydro tests are often required after shutdowns and repairs in order to validate that equipment will operate under desired conditions once returned to service. Furthermore, hydrostatic

  • Industrial Inspection Inspection 4 Industry LLC,Provides Global Industrial Inspection Services. The services covers shop inspection, site inspection and plant inspection. The articles are about different inspection field categories such as shop inspection, site inspection, and in-service inspection requirements. The articles present you applicable codes and standards. There will also

  • To ensure the satisfactory performance of a welded structure, the quality of the welds must be determined by adequate testing procedures. Therefore, they are proof tested under conditions that are the same or more severe than those encountered by the welded structures in the field. This page contains visual inspection tips. The following pages contain inspection methods for GMAW and physical weld

  • PostHeating In case of alloy steel materials such as Cr-Mo stels, if the post weld heat treatment is not performed immediately after welding, then the weld joint and adjacent portion of pipe, at least 50 mm on either side of pipe, shall be uniformly heated to 300°C. This temperature shall be maintained for half an hour minimum, and then wrapped with mineral wool before allowing it to cool

  • Why is preheat sometimes required before welding? Preheating the base material to be welded minimises the temperature difference between the material and the arc, slows the cooling rate in the weld area and reduces the risk of cracking. The need for preheat increases with steel thickness, weld restraint, the carbon/alloy content of the steel, and the diffusible hydrogen of the weld metal. Preheat

  • Welding Inspection Procedure / Checklist This article provides you a general welding inspection proceduer. Stage 1 - Welding Inspection Prior to Welding Work Welding symbols and weld sizes clearly specified in drawing and related documents. Weld joint designs and dimensions clearly specified in drawings and related documents. Weld maps identify the welding procedure

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