Plastic (PPE, HDPE) welding standards

There are tests for plastic welds, below is a selection of relevant tests. EN 12814-1:1999: ‘Testing of welded joints of thermoplastics semi-finished products – Part 1: Bend test’ EN 12814-2:2000: ‘Testing of welded joints of thermoplastics semi-finished products – Part 2: Tensile test’ EN 12814-3:2000: ‘Testing of welded joints of thermoplastics semi-finished products – Part 3: Tensile creep test’ EN 12814-4:2001: ‘Testing of welded joints of thermoplastics semi-finished products – Part 4: Peel test’ EN 12814-5:2000: ‘Testing of welded joints of thermoplastics semi-finished products – Part 5: Macroscopic examination’ EN 12814-6:2000: ‘Testing of welded joints of thermoplastics semi-finished products – … Continue reading Plastic (PPE, HDPE) welding standards

Welding fatigue assessment

Designing for fatigue is very different than designing for static loads.  One of the biggest challenges is being able to estimate the loads, timing of the loads and duration of the loads.   If you look at a bridge you have to estimate the number of vehicles going on the bridge every day, the weight of these vehicles, and other forces and loads acting on the bridge such as its own weight (steel and concrete), wind loading, and pre-existing stresses such as those caused by welding. Four of the main factors that will affect the fatigue life of a welded structure … Continue reading Welding fatigue assessment

EN 81-20/50: NEW LIFT STANDARDS

New European Standards – EN 81-1 EN 81-2 Almost 3 years ago, new European standards for the design, manufacture and testing of lifts were introduced. The standards apply to both passenger lifts and passenger goods lifts and come with the catchy names of EN81-20 and EN81-50. The introduction commenced with a three year transition period which ultimately will see the previous standards EN 81-1 and EN 81-2 phased out completely, by 31st of August 2017. From this date any passenger or passenger goods lift placed into service must comply with the new standards. We are now two thirds of the … Continue reading EN 81-20/50: NEW LIFT STANDARDS