Fillet gas mask has the features of comfortable wearing, wider visual field, but complex technology, sealed ability wearing is not easy.
头带式面罩具有舒适性好、视野宽阔，但工艺较复杂、佩戴不易气密等特点。
Weld-shape(butt weld width, size of fillet weld)is an indicator of weld features and it also is an important factor of quality welding.
焊缝尺寸 （如对接焊缝的焊缝宽度、角焊缝的焊角尺寸等 ）是表示焊缝形状特征的指标 ，是影响焊缝质量的重要因素之一。
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