對於碳鋼鋼管隻高溫壓接接合性研究是以壓接模擬實驗與實際工廠高週波生產兩方面進行 ，並藉著不同溫度的變化，觀察其金相組織有何差異並探討溫度逐漸下降時之最初發生裂痕之溫度。並藉著板厚的改變探討其對熱影響區之金相組織與硬度造成之影響。
除此之外，對於鋼管再壓接時所發生的一些問題，如板材之銲接性不良，熱軋鋼板之氧化層厚度變化等導致接合強度之變化等現象，一方面從材料顯微組織上觀察其變化，另一方面藉模擬實驗條件之改變探討其他之可能形成原因。另外銲珠刮除時接合面上還遺留的跳動刀痕對於管材之品質也有嚴重的影響，本研究亦嘗試從各個不同之角度探求其形成的機構。
Both Upset simulation experiment and practical production are presented about the study for the weldabilty of steel tubes in high temperature upset welding, then observer the difference of microstructure by the change of temperature and discusses the temperature of initial crack while temperature decreases gradually. Next, consider the effect of the thickness of plates on the microstructure and hardness in HAZ.
Apart from above, there are some problems, for example the poor weldability of plates, the effect of oxide layer thickness of the hot rolled steel plates on joint strength as upsetting steel tubes and so on. In order to overcome these problems besides observations of the microstructure of materials, also discusses other experiment conditions which may be the causes of defects. The jump tool traces on joint surface after the removal of bead seriously affects the quality of tube, so this paper try to realize formation mechanism from varied standpoints.