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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Avalia??o das t?cnicas de soldagem MIG-P CA e MIG-P CC+ aplicadas ao passe de enchimento em liga de alum?nio AA5083

Fagundes, Ramon Fernandes 09 May 2014 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2015-12-02T19:52:20Z No. of bitstreams: 1 RamonFernandesFagundes_DISSERT.pdf: 2678310 bytes, checksum: cb8e3b285920e36523e7a644404afb83 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2015-12-09T00:19:19Z (GMT) No. of bitstreams: 1 RamonFernandesFagundes_DISSERT.pdf: 2678310 bytes, checksum: cb8e3b285920e36523e7a644404afb83 (MD5) / Made available in DSpace on 2015-12-09T00:19:19Z (GMT). No. of bitstreams: 1 RamonFernandesFagundes_DISSERT.pdf: 2678310 bytes, checksum: cb8e3b285920e36523e7a644404afb83 (MD5) Previous issue date: 2014-05-09 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Por conter propriedades particulares, as ligas de alum?nio vem ganhandocada vez mais espa?o em diferentes ?reas industriais, se tornando alvo deestudo nos mais diversos campos acad?micos. Quando relacionadas asoldagem, estas ligas apresentam algumas peculiaridades que podem vir adificultar a uni?o, como por exemplo a camada microsc?pica de ?xido presentena superf?cie do metal. O processo de soldagem MIG, tamb?m conhecido comoGMAW, possui vers?es desenvolvidas que podem ser eficazes para soldagemdo alum?nio. Sabendo disto, para este trabalho foram escolhidas duas vers?esdo processo MIG pulsado (CC+ e CA) para avaliar qual a que melhor se adequaaplicadas a passe de enchimento de chanfro em chapas de alum?nio AA5083com 8 e 12 mm de espessura respectivamente. Al?m disso, foram avaliados doistipos de arames, ER5087 e ER5183, no que diz respeito ao desempenho deambos na soldagem. Para avaliar as vers?es de soldagem e os arames, foramutilizadas as c?meras de alta velocidade e t?rmica a fim de aferir a transfer?nciamet?lica e o comportamento t?rmico respectivamente, al?m da an?lisemetalogr?fica para visualiza??o macrogr?fica dos cord?es de solda e o ensaion?o destrutivo por radiografia para observa??o de poss?veis descontinuidades.Foi constatado que a t?cnica de soldagem MIG-P CA apresentou melhoresresultados ? frente da outra t?cnica em ambas as condi??es de soldagemimpostas. Quando relacionado aos arames, estes apresentaram resultadossemelhantes, com cord?es uniformes e sem descontinuidades. / For contain beneficial properties, aluminum alloys are gaining more importance in different industrial areas, becoming the subject of study in several academic fields. When related to welding these alloys have some peculiarities that may hinder the union, such as microscopic oxide layer present on the metal surface. The MIG welding process, also known as GMAW, has developed versions that can be effective for welding aluminum. Knowing this, for this paper, two versions of pulsed MIG (CC + and CA) were chosen to evaluate which best suits pass by filling bevel on AA5083 aluminum sheets with 8 and 12 mm thick respectively. Furthermore, two types of wire, ER5087 and ER5183 were evaluated. To evaluate the process and versions of the wires, the high-speed cameras and thermal were used to monitor the metal transfer and the thermal behavior respectively, and the metallographic analysis for macrographic view of the weld beads and non-destructive testing by radiography for observation of possible discontinuities. It was found that the technique of MIG-P CA showed better results ahead of another technique both welding conditions imposed. When connected to the wires, they showed similar results, with uniform cords and seamless

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