In-depth guides on metallurgical and mechanical testing methods, standards, and lab practices.
How proof load tests, periodic inspections, and NDT are applied to lifting devices, and how to evaluate a rented aircraft engine stand like the Trent 700 unit. Load factors, intervals, and documentation explained.
A glossary of 40+ essential metals testing terms and acronyms (UTS, yield strength, elongation, Charpy, HBW, HRC, HV, HK, proof load, macro etch, grain size, OES, MTR) with applicable ASTM standards for quality and welding engineers.
How spark optical emission spectroscopy (OES) delivers rapid quantitative elemental analysis of metals. Covers sample prep, burn placement, standardization and limitations for carbon and sulfur.
Measuring decarburization depth in steel per ASTM E1077: types, microhardness and metallographic methods, sample prep pitfalls, and AMS/ASTM acceptance specs.
Practical comparison of ASTM E112 comparison, planimetric and intercept methods for grain size measurement, with a selection table and Hall-Petch guidance.
Macro etching reveals weld macrostructures for quality assessment. This guide covers procedure, interpretation of fusion zone, HAZ, and defects per ASTM E340.
Checklist for AWS D1.1 and ASME IX weld qualification tests: tensile, bend, Charpy, macro etch, hardness. Includes specimen dimensions, quantity and ID.
Proof load, wedge tensile, and hydrogen embrittlement testing for fasteners per ASTM F606, SAE J429, ASTM A193, and ISO 898-1. Learn procedures, rationale, and acceptance criteria.
Bend test vs tensile elongation: why materials may pass elongation but crack in bending. Explains effects of surface condition, strain rate, anisotropy.
Charpy V-notch impact testing per ASTM E23 measures toughness via absorbed energy, lateral expansion and shear fracture; covers transition curves and sub-size specimen effects.
Microhardness testing per ASTM E384 for case depth, decarburization and coatings. Covers Vickers and Knoop traverse testing, load selection, spacing rules and depth-vs-hardness plots per AMS/SAE specs.
ASTM E140 hardness conversions are empirical correlations valid only for specific alloy families. Learn why converting across steel, aluminum, and copper groups introduces significant error and when direct testing is mandatory.
Practical comparison of Rockwell, Brinell, and Vickers hardness tests: indenter types, loads, ASTM standards, applications, and how to choose the right method for QA, welding, and procurement.
A step-by-step guide to reading ASTM E8 tensile test reports. Learn what yield strength, UTS, elongation and reduction of area reveal about a metal, common unit mix-ups and red flags that suggest a bad test.
Engineering stress vs true stress explained with formulas, necking correction and a side-by-side comparison table. Covers when to use each for FEA, forming simulations and ASTM E8/E646 compliance.
Mechanical testing of metals: tensile, hardness, impact, bend and fastener tests organized by strength, ductility and toughness. Includes decision flowchart for test selection.