• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 626
  • 489
  • 176
  • 74
  • 52
  • 41
  • 35
  • 31
  • 23
  • 8
  • 7
  • 6
  • 5
  • 5
  • 5
  • Tagged with
  • 1873
  • 454
  • 378
  • 339
  • 326
  • 280
  • 239
  • 228
  • 185
  • 167
  • 152
  • 143
  • 138
  • 133
  • 127
  • 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.
121

Mathematical modelling of waves and flows in laser welding

Postacioglu, Mehmet Nazmi January 1989 (has links)
No description available.
122

Analysis of welding in comparable steel grades : Influence of steel grade on the welding process / Analys av svetsning i jämförbara plåtkvalitéer : Plåtens inverkan på svetsprocessen

Andersson, Stefan January 2014 (has links)
This master thesis is written to examine the influence of different low carbon steel sheet materials on the GMAW welding process. During welding the properties of the base material influence the productivity of the welding process. The purpose of this thesis is to examine how the choice of material and welding speed affect the welding process and the productivity. A literature survey was performed to describe the welding technique and the differences in manufacturing for the sheet materials as well as the effect of alloying and welding on the sheet material. Defects in the weld and methods used to determine them are explained. Test pieces of the different sheet materials were welded with the GMAW process and examined. The result shows that there is a variation in the welding process regarding weld penetration. Measurements also show that welding speed and gap have little influence on the hardness of the weld and heat-affected zone and that the S355MC is more likely to suffer from a narrower toe transition radius than S355NL and S355MC Si. This and the higher area in the Y2 region for the S355MC could indicate a stronger inward flow in the weld pool during welding possibly a result of surface active agents such as oxygen and sulphur. / Denna uppsats skrevs för att undersöka hur olika lågt legerade kolstål påverkar svetsprocessen för gasmetallbågsvetsning. Under svetsning påverkar materialets egenskaper produktiviteten för svetsprocessen. Syftet med denna uppsats är att undersöka hur svetshastighet och materialval påverkar svetsprocessen och produktivitet. En litteraturstudie genomfördes för att beskriva svetsprocessen och olikheter i tillverkningen av de olika plåtkvaliteterna samt hur olika legeringsämnen påverkar plåtkvaliteten. Dessutom beskrivs Svetsdefekter samt metoder för detektering av svetsdefekter förklaras. Testbitar av de olika plåtkvaliteterna svetsa samman genom gasmetallbågsvetsning och undersöks sedan. Resultatet visar på att variationer i svetsprocessen förekommer vid mätning av inträningen. Resultat visar även på att svetshastigheten och förekomsten av en spalt har liten inverkan på hårdheten i svetsen eller den värmepåverkade zonen samt att S355MC i större utsträckning lider av en snävare övergångsradie an S355NL och S355MC Si. Detta tillsammans med en större area i Y2 regionen av svetsen tyder på att S355MC kan leda av ett starkare inåtgående flöde i smältan vilken kan påverkas av ytaktiva ämnen som syre och svavel.
123

Electrically powered variable speed oxyacetylene burning machine : a creative project

Bryan, Harry Norman January 1967 (has links)
There is no abstract available for this thesis.
124

The mechanics of high velocity oblique impact between a projectile and an anvil

McKee, Fredric Albert January 1975 (has links)
No description available.
125

Design of an experiment to investigate the effects of electrode bearing area, weld-pressure, and current on the penetration and tensile-shear strength of resistance spot weldments in SAE CR 1010 sheet steel /

Fitzgerald, William Roy, January 1964 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute, 1964. / Vita. Abstract. Includes bibliographical references (leaves 125-128). Also available via the Internet.
126

The influence of alloying additions on the microstructure and mechanical properties in high current GTA welding of structural steel /

Viano, David Michael. January 1998 (has links) (PDF)
Thesis (M. Eng. Sc.)--University of Adelaide, Dept. of Mechanical Engineering, 1999. / Includes bibliographical references (leaves 159-173).
127

The effect of welding heat on the properties of concrete /

Whitescarver, John Penn, January 1962 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute, 1962. / Vita. Abstract. Includes bibliographical references (40-41). Also available via the Internet.
128

Analysis and testing of laser welded steel sandwich panels /

Yorulmaz, Serdar, January 2008 (has links)
Thesis (M.S.) in Mechanical Engineering--University of Maine, 2008. / Includes vita. Includes bibliographical references (leaves 129-130).
129

Monitoring and control in friction stir welding

Fleming, Paul, January 2009 (has links)
Thesis (Ph. D. in Electrical Engineering)--Vanderbilt University, May 2009. / Title from title screen. Includes bibliographical references.
130

Fundamental study of joining titanium alloys using electroslag technology /

Chen, Sin-Jang, January 1991 (has links)
Thesis (Ph. D.)--Oregon Graduate Institute of Science and Technology, 1991.

Page generated in 0.0791 seconds