The grab arm of the long arm excavator is made of 15Mn steel plate. Sometimes the original weld itself has bubbles, slag and tiny cracks. It is necessary to use a small hammer to light the weld, and to use a magnifying mirror for observation when necessary.
When the steel machine is overloaded, the original weld will produce small cracks and expand slowly: the welding rod is not compatible with the property of the plate, and produces cracks. Because the volume of the steel manipulator is large, it is difficult to use the reliable and effective heating and heat preservation measures. After welding, the hardened zone of the weld periphery is not completely removed, which leads to the strength of the weld. Drop: during the operation of the grabbing machine, the vibration impact is large, and the uneven stress on the weld seam causes the weld cracking.
Thoroughly weld the weld, remove rust and apply anti rust paint. The long arm excavator is excavating the construction site. For the existing corrosion welds, it can choose to remove rust by hand. The disadvantage is that the labor intensity is great, the labor cost is higher, and the acid cleaning method is also used, that is, the organic acid is the main basic section, with the corrosion inhibitor, the surfactant, the rust removing agent, the antirust agent and the formation. The membrane and other composite materials are modulated into an acid pickling solution with rust removal, rust prevention and primer functions. The rust and rust prevention purpose is achieved through cleaning.
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