窄焊缝中的任何未熔合通过在两块薄板结合处低波之间出现的一系列中间回波被显示出来。
A too narrow weld and any lack offusion are indicated by a series of intermediate echoes within the echosequence from the total thickness of the two welded sheets.
发现超窄间隙焊的焊接电压范围在21 ~ 24v，电流在210 ~ 270a能够得到较好的焊缝成形。
When welding voltage is between 21v and 24v and welding current is between 210a and 270a, better welding line can be obtained.
激光焊缝窄，基材锌层阳极保护作用得以保存，激光焊接板仍具有较好耐蚀性。
Since laser weld is narrow, and the anode protection effect of zinc on the base metal was not destroyed, the joint has good corrosion resistance.
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