【theshield】...inweldshapeasaresultofchangingtheshieldgasbut...

英语翻译3.ResultsCross-section macrographs of the four welds are presented inFigs.2 and 3.There are minor differences in weld shape as a resultof changing the shield gas,but the main difference is the increasein weld width between the fast (9 m/min) and slow (1.5 m/min)welds.This increase in weld width at reduced welding speed is a resultof increased lateral thermal conduction associated with longerlaser-material interaction times.The cross sections presented in Fig.4 were etched in NaOH liq-uid using a voltage of 2.5 V for 10 s.This etching technique makesthe ferrite areas corrode more and become darker.The austen-ite and ferrite phase contents of the welds were then measured from the cross sections by using the area measurement system ofa Keyence VHX 2000 microscope.The austenite contents of thewelds are shown in Table 2.It is apparent that the use of nitro-gen as the weld shield gas increases the austenite level of the weldproduced.fig指的是图 英语