What is CTOD test?

July 11, 2021 Amarine Antonio

Related specifications BS 7448 Parts 1- 4 Fracture Mechanics Toughness Tests BS 7910 Guide on Methods for Assessing the Acceptability of Flaws in Metallic Structures. ASTM E1820 Standard Test Method for Measurement of Fracture Toughness. BS EN ISO 15653 Metallic Materials – Method of test for the determination of quasistatic fracture toughness of welds Applicable CTOD Standards CTOD testing is performed on set of 3 no. of test samples; that are representative of an actual component thickness (B) and is subjected to in-service (representative) loading conditions and minimum design temperature. The test specimen has machined Notch along with a genuine … Continue reading What is CTOD test?

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What is Stress and Strain Curve?

July 11, 2021July 11, 2021 Amarine Antonio

Relevant specifications BS EN 10002 Methods of tensile testing of metallic materials.BS EN 876 Destructive tests on welds in metallic materials – longitudinal tensile test.BS EN 895 Destructive tests on welds in metallic materials – transverse tensile test.BS EN ISO 7500-1 Tension/compression testing machines. verification and calibration of the force measuring system.ASTM A370 Mechanical testing of steel products.ASTM E8 Tension testing of metallic materials.ASTM B557 Tension testing wrought and cast aluminum and magnesium alloy products. In engineering and materials science, a stress–strain curve for a material which showing the relationship between stress and strain of a material section subjected to … Continue reading What is Stress and Strain Curve?

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What is Marangoni effect in GTAW welding?

June 28, 2021 Amarine Antonio

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?

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How to determine preheating exemption in welding?

June 25, 2021 Amarine Antonio

As discussed in our previous article Preheating temperature distance range preheat is really necessary in steel welding to control the cooling rate. More specifically, preheat is used to slow the cooling rate down in order to prevent excessive hardness in the … Continue reading How to determine preheating exemption in welding?

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What is Submersible pump

June 19, 2021June 19, 2021 Amarine Antonio

A submersible pump is an equipment that pushes the fluid to the surface instead of pulling it out. This pump has a sealed motor coupled with the pump’s body that pushes the liquid to the surface. Submersible pumps are mainly … Continue reading What is Submersible pump

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Why WPS need to be qualified?

June 17, 2021 Amarine Antonio

If you own or work at a job shop you may have noticed an increase in the number of customers that require the use of qualified welding procedures to build their products. Some fabricators are even getting this request from long time customers who never required them in the past. So why is this? The purpose of having a welding procedure specification (WPS) is to give the welder detailed instructions on how to make a weld. These instructions consist of parameters that need to be used such as amperage, voltage, travel speed, transverse and travel angles, gas flow rate, etc. … Continue reading Why WPS need to be qualified?

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Vibration test example

April 8, 2021April 8, 2021 Amarine Antonio

Example of balancing a huge fan with much more vibration than first one. Result after repair: Vibration went from 3.1 mm/s to 0,2mm/s. Total 1,6kg was needed to get it perfect 🤩 #vibrationanalysis #vibrationtesting #balancing Continue reading Vibration test example

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API 570 Quiz (ASME 31.3 – MDMT and Impact Test)

March 10, 2021 Amarine Antonio

If you don’t know how API 570 Certification scheme, See API 570 Certification Instruction IMPACT TESTINGThe inspector should be able to:a) Determine the minimum metal temperature of a material (MDMT), which is exempt from impact testing (ASME B31.3, Section 323.2.2, Figure … Continue reading API 570 Quiz (ASME 31.3 – MDMT and Impact Test)

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API 570 Quiz (ASME 31.3 – Pressure Testing)

March 9, 2021 Amarine Antonio

If you don’t know how API 570 Certification scheme, See API 570 Certification Instruction PRESSURE TESTINGThe inspector should be able to:a) Demonstrate knowledge concerning hydrostatic leak testing (ASME B31.3 Section 345.4)b) Demonstrate knowledge concerning pneumatic leak testing (ASME B31.3 Section 345.5)c) … Continue reading API 570 Quiz (ASME 31.3 – Pressure Testing)