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发明公开
CN105195913A 一种现场管道窄间隙焊的坡口结构及其装配方法 有权

一种现场管道窄间隙焊的坡口结构及其装配方法
摘要：
本发明涉及一种现场管道窄间隙焊的坡口结构，包括具有第一钝边的第一管道，具有第二钝边的第二管道，第一、第二钝边相固定使第一、第二管道间形成坡口，第一钝边为公口形钝边，第二钝边为母口形钝边，公口形钝边与母口形钝边相过盈配合。一种现场管道窄间隙焊坡口结构的装配方法，包括：对母口形钝边进行加热至150℃~450℃或者对公口形钝边进行冷却至-50℃~-150℃，将公口形钝边插入至母口形钝边固定成一个整体，将整体降温或升温至常温或焊接预热温度。本发明采用钝边的公母配合的结构改善，代替的现有的点焊固定，无需复杂的工装卡具即可实现，结构、安装简单，能够有效提高焊接的质量。
摘要（英）：

The invention relates to an on-site pipeline narrow gap welding groove structure which comprises a first pipeline with a first blunt edge and a second pipeline with a second blunt edge, wherein the first blunt edge and the second blunt edge are fixed to form a groove between the first pipeline and the second pipeline; the first blunt edge is a convex-opening-shaped blunt edge; the second blunt edge is a concave-opening-shaped blunt edge; the convex-opening-shaped blunt edge and the concave-opening-shaped blunt edge are in interference fit. The invention further provides an assembly method for the on-site pipeline narrow gap welding groove structure. The assembly method comprises the following steps: heating the concave-opening-shaped blunt edge to 150-450 DEG C or cooling the convex-opening-shaped blunt edge to minus 50-minus 150 DEG C, inserting the convex-opening-shaped blunt edge into the concave-opening-shaped blunt edge to form a whole, wholly cooling or heating to room temperature or welding preheating temperature. According to the invention, the structure improvement that the convex-opening-shaped blunt edge is matched with the concave-opening-shaped blunt edge is adopted to replace conventional spot welding fixing, narrow gap welding can be realized without a complex tool clamping apparatus, the structure and mounting are simple and the welding quality can be improved effectively.

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