Managing the influence of microstructure defects on the strength of EN AW 5754 aluminium alloy welded joints executed with the TIG method

Abstract

The paper concerns the issue of the impact of welding defects on the strength of EN AW 5754 aluminium alloy welded joints, executed with the TIG welding method (tungsten inert gas, i.e., a method of welding with a non-consumable tungsten electrode shielded with inert gases). The article presents examples of operating damage to welded joints and discusses the factors impacting the weld quality. The strength test results of welding samples taken under different process parameters were presented. The impact of welding defects and non-conformities identified with a CAT test on the weld joint impact was analysed. The studies showed a strong relation between the presence of welding defects, welding process parameters and weld strength.

Correlation between Strength, Hardness and the Share of Welding Imperfections in an AW 5754 Aluminium Alloy Weld Executed with the TIG Method

“…Siły statyczne wywołują odkształcenia spowodowane stałym obciążeniem konstrukcji. Natomiast obciążenia dynamiczne charakteryzują się zmiennym, a niekiedy gwałtownym działaniem sił zewnętrznych lub bezwładnościowych, powstających wskutek przyspieszeń masy [10,12]. W celu zapewnienia bezpiecznej i niezawodnej eksploatacji konstrukcji spawanych niezbędne jest spełnienie wielu wymogów technologicznych.…”

“…Static forces induce strains caused by constant load of the structure. However, the dynamic loads are characterised by variable and sometimes rapid action of external or inertia forces generated as a result of mass acceleration [10,12]. In order to ensure safe and reliable operation of welded structures, it is necessary to satisfy numerous process requirements.…”