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耐熱鋼和高溫合金是很寬的合金領域.在高溫構件的制造過程中.焊接過程是極重要的一個工序。由于被焊接的合金所涉及的范圍極廣.它們的成分及焊接冶金學問題極其復雜.這些復雜性包括以下內容.

Heat resistant steel and high temperature alloy are widely used in the field of high temperature components. Because the alloy is welded to a very wide. Their composition and welding metallurgy problems are very complex. The complex includes the following contents.

O合金系統復雜:可以是鐵基合金《低、中及高合金鋼、各種類型不銹鋼、甚至含很高Cr. Ni等合金元素的鐵基高溫合金).也可以是以Ni或C。為基的成分十分復雜的合金系統.

The complex system can be: O alloy iron-based alloy iron-based alloy ", in low and high alloy steels, various types of stainless steel, even with high Cr. Ni alloy elements). Can also be based on Ni or C. A very complex alloy system based on components

②合金組織結構復雜:可以是鐵素體或珠光體（貝氏體)組織.也可以是馬氏體組織或奧氏體組織;可以是單相組織.也可以是多相混合組織;可以從凝固到室溫為單相狀態.也可以隨溫度降低而發生相轉變.而且相轉變產物類型、數量和形態以及性能與冷卻速度相關。某些合金由于成分差異和溫度經歷不同可能出現各種析出相.大大影響到合金的性能。

The organization structure is complex: Alloy ferrite or pearlite (bainite) organization. Can also be martensite or austenite; can be single organization. It can also be multi phase hybrid organization; from solidification to room temperature for single-phase state. Can also occur with the decrease of temperature and phase transition. Phase transformation product type, quantity and morphology and performance and cooling speed. Because of the difference of composition and temperature, some precipitates may occur in some alloys.