When testing structures for safety, one ought to focus on welded sections, as experience has proven that such welded sections of the core structure tend to be responsible where there is failure, and usually the weakest structural point. with complex metallurgic and dynamic characteristics, welded pa...
When testing structures for safety, one ought to focus on welded sections, as experience has proven that such welded sections of the core structure tend to be responsible where there is failure, and usually the weakest structural point. with complex metallurgic and dynamic characteristics, welded parts are susceptible to problems ; initial stage fault possibility, partial adaptation capability, deformation condensation degree, residual stress, and partial heat deterioration. The purposes of this research were threefold. First, this research inspected welding fault possibility through Non Destructive Inspection after MIG welding with both the same(A6061T6, A5052O), and different aluminium(A6061T6+A5052O) In addition, experimental results were compared. Finally, Hole Drilling Method and Finite Element Method Analysis were conducted on possible residual stress subsequent to experimentation. The results are show below.
1. It was found that both Non-destructive Inspection and mechanical material experimentation both indicated that optimum quality MIG welding is key in yielding best results.
2. In the case of mechanical material experimentation, results indicate that welding material A6061T6 provide for diminished yield strength and ultimate strength as compared to the base structure. However results indicate that in the case of welding material A5052O, no diminishment in either case was indicated by test results. Thus, tests indicate that in the case of material A6061T6, diminished strength follows heat-treatment of high-strength alloy resulting from annealing effect. Where cold-working was applied, A5052O results indicated no strength diminishment. Where different materials were used, no variation in results was found.
3. Analysis of test results show that width of material in the heat-effedted zone is a key variable in determining ultimate atrength. Where material width exceeds 10mm, results indicate diminished thensile residual stress levels. At convergence point, levels reached zero. Although there was a nominal difference between predicted and actual test levels, overall results reflected expectations.
Residual stress analysis examined the distribution of residual stress in aluminium welding materials. Results indicate that in welding structures. further research and experimentation will facilitate further diminishment of residual stress levels.
When testing structures for safety, one ought to focus on welded sections, as experience has proven that such welded sections of the core structure tend to be responsible where there is failure, and usually the weakest structural point. with complex metallurgic and dynamic characteristics, welded parts are susceptible to problems ; initial stage fault possibility, partial adaptation capability, deformation condensation degree, residual stress, and partial heat deterioration. The purposes of this research were threefold. First, this research inspected welding fault possibility through Non Destructive Inspection after MIG welding with both the same(A6061T6, A5052O), and different aluminium(A6061T6+A5052O) In addition, experimental results were compared. Finally, Hole Drilling Method and Finite Element Method Analysis were conducted on possible residual stress subsequent to experimentation. The results are show below.
1. It was found that both Non-destructive Inspection and mechanical material experimentation both indicated that optimum quality MIG welding is key in yielding best results.
2. In the case of mechanical material experimentation, results indicate that welding material A6061T6 provide for diminished yield strength and ultimate strength as compared to the base structure. However results indicate that in the case of welding material A5052O, no diminishment in either case was indicated by test results. Thus, tests indicate that in the case of material A6061T6, diminished strength follows heat-treatment of high-strength alloy resulting from annealing effect. Where cold-working was applied, A5052O results indicated no strength diminishment. Where different materials were used, no variation in results was found.
3. Analysis of test results show that width of material in the heat-effedted zone is a key variable in determining ultimate atrength. Where material width exceeds 10mm, results indicate diminished thensile residual stress levels. At convergence point, levels reached zero. Although there was a nominal difference between predicted and actual test levels, overall results reflected expectations.
Residual stress analysis examined the distribution of residual stress in aluminium welding materials. Results indicate that in welding structures. further research and experimentation will facilitate further diminishment of residual stress levels.
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