AUTOMATIC TIG WELDING PROCESS STUDY WITH DYNAMIC POWER SUPPLY, EVALUATING AUTO RESTRICTED SOLIDABILITY TEST, RESIDUAL TENSIONS, SOLIDIFICATION AND THERMAL CYCLES IN AXIAL FAILURE BEHAVIOR IN C-Mn-Si STEEL.

• Grant number: 18/18904-7
• Support type: Regular Research Grants
• Duration: March 01, 2019 - April 30, 2021
• Field of knowledge: Engineering - Mechanical Engineering
• Principal researcher: Herman Jacobus Cornelis Voorwald
• Grantee: Herman Jacobus Cornelis Voorwald
• Home Institution: Faculdade de Engenharia (FEG). Universidade Estadual Paulista (UNESP). Campus de Guaratinguetá. Guaratinguetá , SP, Brazil
• Assoc. researchers: Nasareno das Neves

Abstract

The variant on the electric arc welding automatic TIG process with additional mechanization dynamics system of consumable wire feed demand scientific research to evaluate the physical and chemicals effects on metallurgical of welding like: solidification mode, mechanical properties and fatigue life associated with the variations of frequencies of the feeder. The consumable rod replacement by wire coil in the automatic variant with dynamic power feeding on welding melting pool indicate new ways to increase the deposition and/or melting rates. The TIG process has relevant advantages : - low hydrogen in weld metal and the facto that It does not change the chemical composition of the filler metals adding on melting pool due there is no metal transfer through the electric arc and inert gas protection. The present research project aims to revise and modify the weldability Self-restraint tests , for investigation of AUTOMATIC TIG welding process with DYNAMIC POWER FEEDING. These changes include the introduction of data acquisition systems "in situ" of welding thermal cycles and of residual stresses. In this way, it is intended to investigate the effects of dynamics feeding in the TIG process with real-time survey of welding thermal cycles, cooling rate and residual stresses. This project includes also the study, in butt joint type V, the effects of dynamic power feeding in automatic TIG process related on solidification, deposition or fusion rate , in heat-affected zone microstructure, in mechanical properties and in fatigue life fatigue behavior of welded joint in base metal steel C-Mn-Si ASTM A 516-70. (AU)