Investigation of fatigue strength and norms of emission of harmful substances in the air during MIG and TIG welding of 1460 aluminium-lithium alloy

Abstract

This work presents the results of studying harmful substances in the air, released in the case of tungsten inert gas (TIG) and metal inert gas (MIG) welding of 1460 aluminum alloy (Al-Cu-Li). It is shown that the TIG process is accompanied by smaller evolution of the solid component and gas component of welding fumes than in MIG welding. Ozone concentrations during TIG and MIG welding are significantly (1.3 and 7.4 times, respectively) higher than the maximum permissible concentration. It is found that ultraviolet radiation, accompanying the welding process, is the main factor of toxic gas generation in the working zone of the studied aluminum-lithium alloys. Also, this paper presents analyses of microstructure, hardness, strength characteristics and fatigue behavior of 1460 TIG weld joints.

Noise level assessment and mechanical properties of welded joints of aluminium alloys of the Al-Cu-Li system in FSW and TIG welding

“…The main features that determine the fatigue life of welded joints specimens are microstructure, degree of softening and residual stresses (R). Fatigue testing that was previously performed shows that fatigue limit at stress ratio Rs =0.1 of FSW joints exceeds TIG joints in 1.3 time [13,14]. Estimation of stress intensity factors using an approximate method using a computer program based on the finite element method is presented in the work by Kastratović et al [15].…”

Effect of Load Eccentricity on Stress Condition of Butt Welded Joint with Asymmetrical Reinforcement

“…If 𝑏 0 > 𝑏 𝑒1 , then in second Eq. ( 11) and condition (12) one should take 𝑏 0 = 𝑏 𝑒1 and 𝑦 0 = 𝑦 1 .Thus, the stresses at points A and C will be determined as:…”

“…This is confirmed by the tests of samples of 1460 Al-alloy butt joints, welded by TIG welding. The failure of samples under the uniaxial static tension according to [12] occurred in the transition zone from the weld root reinforcement to the base metal. Therefore, development of an integrated approach to assessment of the influence of face-side reinforcement geometry on the root side stress condition is relevant.…”