楊琦棟　趙輝

摘 要：本文針對于我廠大型高爐布料氣密箱齒輪軸在生產(chǎn)使用過程中出現(xiàn)裂紋或磨損的情況，分析了該軸所用42CrMo鋼化學(xué)成分以及焊接性能，介紹了42CrMo鋼焊接材料的選擇，預(yù)熱及層間溫度的選擇，以及后熱溫度的確定，通過對齒輪軸焊接工藝評定試驗，證明此次齒輪軸焊接修復(fù)工藝以及參數(shù)是可行的，最后，總結(jié)了焊接過程應(yīng)注意的問題，為相同應(yīng)用場合42CrMo鋼的焊接提供參考價值。

關(guān)鍵詞：42CrMo鋼 焊接技術(shù) 現(xiàn)場焊接

Repair Welding Technology of Gear Shaft of Airtight Box of Large Blast Furnace Distribution

Yang Qidong Zhao Hui

Abstract：This article analyzes the chemical composition and welding performance of 42CrMo steel used in the shaft for the cracks or wear in the production and use of the gear shaft of the airtight box of the large blast furnace distribution box in our factory， and introduces the selection of 42CrMo steel welding materials. The selection of heat and interlayer temperature， as well as the determination of the post-heat temperature， through the gear shaft welding process qualification test， proved that the gear shaft welding repair process and parameters are feasible， and finally， the article summarized the problems that should be paid attention to in the welding process to provide reference value to the welding of 42CrMo steel in the same application situation.

Key words：42CrMo steel， welding technology， field welding