The waterproof layer of the lap joint should stick (welding) firm, tight sealing, no distortion, fold, curling and blister defects.

卷材屋顶防水层的搭接缝应粘(焊)结牢固，密封精密，不得有扭曲、皱折、翘边和起泡等缺陷。

youdao

The Boeing 737-300 in question was only 15 years old when its skin peeled open along a riveted lap-joint while flying above 34,000 feet (just over 10,000 metres) with 118 passengers on board.

正在讨论的波音737-300型飞机只用了15年。 当其外壳沿敲平的上端搭接接头剥落开来时，飞机上的118位乘客正飞行在34000英尺（刚刚超过10,000米）的上空。

youdao

The Boeing 737-300 in question was only 15 years old when its skin peeled open along a riveted lap-joint while flying above 34, 000 feet (just over 10, 000 metres) with 118 passengers on board.

正在讨论的波音737 - 300型飞机只用了15年。当其外壳沿敲平的上端搭接接头剥落开来时，飞机上的118位乘客正飞行在34000英尺(刚刚超过10,000米)的上空。

youdao

The Boeing 737-300 in question was only 15 years old when its skin peeled open along a riveted lap-joint while flying above 34, 000 feet (just over 10, 000 metres) with 118 passengers on board.

ECONOMIST: Aircraft fatigue

As an emergency precaution, the Federal Aviation Administration has now said that carriers operating 737s with the same lap-joint design along the roof should inspect the planes after no more than 30, 000 cycles.

ECONOMIST: Aircraft fatigue