晶体有明显的熔点,而树脂只有软化区域。树脂产生脆性的温度为Tg,当其慢慢加热失去脆性时,还不是液态,继续加热才能达到液化的温度界线,这时才能从熔融物中抽出丝来,这个温度为Tr,在温度Tg和Tr之间就是软化区域。例如松香的Tg℃为29.5,Tr℃为52.5,Tg-Tr℃为23。树脂变脆的软化区域下限温度Tg也叫冻点。
预制棒至少一个几何参数的测量,包括确定软化区域至少一部分的轮廓,如颈部区域轮廓的图像。
Measuring at least a geometrical parameter of the preform may comprise determining the profile of at least a portion of the softened region e. g. an image of the neck region profile.
与母材相比,焊接后的试样抗拉强度减小了大约20 ~ 30%,试样在软化区发生断裂,该区域通常是热影响区。
Reduction of UTS of about 20-30% with respect to base material occurred with rupture in the softened zone of welding, usually HAZ.
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