Processing method for controlling planeness of flange by use of predeformation process

The invention relates to a processing method for controlling the planeness of a flange by use of a predeformation process. The processing method is characterized by comprising the following steps: (1) at first, welding an end cap with a sensor connector through a conventional welding process; (2) predeforming a welding face of the flange to enable the deformation of the welding face of the flange to be 0.4-0.6 mm; and (3) welding the end cap with the welding face of the flange and welding bolts on the welding face of the flange, wherein the planeness of a mounting face of the welded flange does not exceed 0.4 mm. The processing method is easy to implement, high in reliability and lower in labor intensity, and can guarantee the processing quality and the dimensional precision of components, the production efficiency is improved, and the production cost is lowered. 本发明涉及种运用预变形法控制法兰平面度的加工方法，其特征是，包括以下步骤：（1）首先将端盖与传感器接接头采用常规焊接工艺进行焊接；（2）对法兰的焊接面进行预变形，使法兰焊接面的变形量为0.4-0.6mm；（3）将端盖和法兰的焊接面进行焊接，再在法兰焊接面上焊接螺栓；焊后法兰安装面的平面度不超过0