焊缝位置和壁厚差异变化时，拼焊管各区域的应力状态保持不变。

Weld-seam position and thickness difference do not affect stress and strain states.

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车身呈流线型，车棚采用厚方管做骨架。

The body streamlined, carport USES skeleton thick square tube.

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车身呈流线型，车棚采用厚方管做骨架。

The body streamlined, carport USES skeleton thick square tube.

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