English Name: welding - Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) - Quality levels for imperfections.
简体中文标题：焊接。钢、镍、钛和其合金的熔焊接头(束焊除外)。缺陷的质量等级。
Objective: To compare the clinical effects after root canal preparation with hand use stainless steel file, nickel titanium alloy engine file and root canal ultrasonic file.
目的：比较手用不锈钢锉，镍钛合金机用锉和超声根管锉在根管预备后的临床效果。
Copper - nickel, nickel titanium, copper - titanium, titanium - molybdenum, brass - copper, mild steel - copper and other dissimilar metal weld between.
铜—镍、镍—钛、铜—钛、钛—钼、黄铜—铜、低碳钢—铜等多种异种金属间的焊接。
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