| Summary: | 碩士 === 國立虎尾科技大學 === 機械與電腦輔助工程系碩士班在職專班 === 102 === Burn-through by the wall angle simulated weld diameter 4 "SS304 stainless steel pipe thickness 3mm 10s level to normal pressure , air pressure ( air, nitrogen ) , hydraulic ( water ) to simulate the pressure inside the pipe , with the group using the SMAW welding current variables and GTAW welding , each current value of the group from 10A to weld of burn through the wall , as measured by normal pressure test weld heat-input is 1.13KJ/mm for burn-through the wall, and the welding current at 120A, the pipe inside wall welding surface is oxidation and darkly .Air pressure test welding heat-input is 1.41KJ/mm for burn-through the wall, when welding currwhen at 150A, the pipe inside wall welding surface is oxidation and darkly. Hydraulic test weld heat-input at 2.36KJ/mm, hydraulic welding current and wear due to the volume filled with water under pipe conditions , oxidation of the inner wall of no obvious wear at 270A welding pipe . penetration of heat from the welding data understanding , cooling capacity is greater than the hydraulic pressure in the under the same conditions of heat input , heat capacity and rapid hydraulic tube , resulting in a lower pressure relative to the inner wall temperature , so the welding heat input welding wear than when the hydraulic pressure to come high, so get penetration weld heat regulatory limit values as under the revised security control heat input welding , and draw with pressure welding heat input into the control table to ensure the implementation of security while online with pressure pipeline repair and operations personnel , through the study of this article is available to pipeline owners and managers, welders , engineers, provide the basis for a reference value
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