Muffle tube

Posted by Wangkiky Wangkiky over 6 months ago

The defects of A1 tube are as follows: the first ring weld cracking, the design defects of the two hoisting flanges and the local drum, the banana shaped bending, the severe necking of the A segment, the thinning of the wall thickness, the large area cracking and the cross section deformation. Therefore, taking full consideration of the characteristics of the above defects, the repair scheme adopted is: first, a manual cutting machine is used to cut off the cylinder of about 100mm on both sides of the first weld and re welding (the length should be fixed according to the coloring to check the crack condition); (2) cut the flange two times by hand cutting machine and cut off the drum section about 400mm. The end surface of the cylinder body is flat, then the double side chamfering is then butted, and the replacement material of the thickness 15mm is used to make the tube welded in the rear of the muffle tube to the total length of 28522mm; (4) the structure of the two hoisting flange and the installation part are redesigned, and the whole flange welding structure is replaced by a segmented flange welding structure. The main defects of A2 tube are as follows: two times of flanges in hoisting, multiple flanges, bananas, severe necking of A segment, thinning of wall thickness, large area cracking and cross section deformation. Therefore, the following repair schemes are taken into full consideration: (1) cutting off the muffle tube with a plasma cutting machine from two hoisting flanges; (2) checking the size of the crack at the perforation of the muffle tube by the coloring penetration examination method, cutting the muffle tube by the manual grinding wheel cutting machine; 3. In accordance with the requirements of the welding groove, because the section of the muffle tube has become elliptical (the long axis is about 1900mm, the short axis is about 1700mm), the butt must be reduced and butted by the ellipse and then hand welded; (4) the weld quality is checked by the coloring penetration inspection method; (5) the replacement steel plate of a certain length at the bottom of the muffle tube (