Effect of PWHT with Sheet-Type Ceramic Heater on Compressive Behaviors of Non-Stiffened Welded Steel Box Columns
Effect of PWHT with Sheet-Type Ceramic Heater on Compressive Behaviors of Non-Stiffened Welded Steel Box Columns
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DOI：
10.4236/wjet.2018.61003
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发表时间：
2018-01
期刊：
影响因子：
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通讯作者：
May Phyo Aung;M. Hirohata
中科院分区：
文献类型：
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作者：
May Phyo Aung;M. Hirohata
为了研究片式陶瓷加热器焊后热处理对焊接箱形柱残余应力、变形和受压性能的影响，进行了一系列基础性试验研究。片状陶瓷加热器能够高精度地控制焊后热处理所需的温度历史。焊后热处理使试样的焊接残余拉应力和焊接残余压应力分别降低了90%和76%。此外，焊后热处理可以减少22%的焊接引起的面外变形。结果表明，焊后热处理试样的刚度略高于焊后试样，当施加单调的静态压缩载荷时，焊接和焊后热处理试样。它们还可以提高压缩极限承载力约32%的焊接试样。结果表明，采用片式陶瓷加热器进行焊后热处理是有效的。
A series of fundamental experimental investigation was conducted in order to examine the effect of PWHT by sheet-type ceramic heater on the residual stress, deformation and compressive behavior of non-stiffened welded box columns. The sheet-type ceramic heater was able to control the required temperature history for PWHT with high accuracy. The welding-induced tensile and compressive residual stresses of the specimens were reduced by 90% and 76% respectively with PWHT. Besides, PWHT could reduce the welding-induced out-of-plane deformation by 22%. It was revealed that the PWHT specimens had a slight higher stiffness than the As-welded specimens when applying monotonic static compressive load on both As-welded and PWHT specimens. They could also enhance the ultimate compressive load capacity about 32% of that of the As-welded specimens. The effectiveness of PWHT with the sheet-type ceramic heater could be confirmed.