Check the weld quality when there is crack at the bottom of the fuel tank of the excavator

The end of the fuel tank mounting base of some certain models of excavators suffered from weld cracking. The steel plate at the bottom of the fuel tank is cracked, causing the fuel tank to leak. The welding seam of the fuel tank base cracked, causing the steel plate at the bottom of the fuel tank to crack and leak oil, mainly due to the following two reasons. First, there are welding quality problems in the welds of the fuel tank base, and second, the fuel tank base structure is unreasonable. This article will explain how to troubleshoot the welding quality problems of the fuel tank base welds.
The fuel tank base is bent into a groove by Q235B steel plate with a thickness of 4.5mm. Then the two sides shall be welded to the bottom of the fuel tank by intermittent welding. The weld is fillet weld, and the weld leg size is 4mm. In order to judge whether the welding quality meets the technical requirements, ultrasonic flaw detection and section cutting inspection shall be carried out for the welds at the cracking position. Through flaw detection and inspection, the weld quality is good and there is no welding defect.