Process for welding WQ890D thick plate
A technology of welding process and welding tools, which is applied in the field of WQ890D thick plate welding process, can solve the problems of delaying cold cracks, affecting the production quality and safe operation of large-tonnage crawler cranes, and achieves the elimination of welding cracks, low cost, and easy welding process operation Effect
Inactive Publication Date: 2013-01-09
SHANGHAI SANY TECH
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Problems solved by technology
[0004] However, the welding of high-strength steel materials is prone to delayed cold cracks, which mainly occur at the weld root of circular butt welds and longitudinal welds, T-shaped joints and the connection parts of frame ribs
This has seriously affected the production quality and safe operation of large-tonnage crawler cranes
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[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.
[0018] The invention provides a reliable and effective welding process for the WQ890D thick plate material used in crawler cranes. Specifically, it is realized through the following parameter settings and operation steps: use MAG / KR350 or KR500 as the welding tool; use JM-68 as the bottom welding wire, and UnionX90 as the filling and capping welding wire, and the diameters of both the bottoming welding wire and the filling and capping welding wire are 1.2 mm; 2 As a protective atmosphere, and CO 2 The gas flow rate was set at 16-24 L / min.
[0019] In the specific welding operation, follow the steps below:
[0020] Step 1: Preheat before welding, the preheating temperature is 100-150 degrees Celsius;
[0021] Step 2: Perform bottom welding, wherein the bottom current is 200A-240A, t...
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Abstract
The invention provides a process for welding a WQ890D thick plate. In the process, MAG / RK350 or KR500 is used as a welding tool; a backing welding wire is JM-68, a filling welding wire is UnionX90, and the diameters of the backing welding wire and the filling welding wire are both 1.2mm; CO2 is used as protective atmosphere, and the flow velocity of the CO2 gas is 16 to 24L / min; preheating temperature is 100 to 150 DEG C; backing current is 200 to 240 A, voltage is 21 to 29V, multilayer backing is performed, and interpass temperature is 100 to 150 DEG C; filling current is 220 to 270 DEG C, voltage is 24 to 29V, multilayer multi-pass welding is performed, and interpass temperature is 100 to 150 DEG C; and after welding, heat treatment is performed, the heat treatment temperature is 300 to350 DEG C and heat is preserved for 2 hours. In the process for welding the WQ890D thick plate, welding cracks on high-intensity steel materials are effectively eliminated by selecting the optimally matched welding materials and optimum welding process parameters so as to obtain high-quality seams and stable welding structures, and fully meet the requirements of the high-intensity steel during actual use and the welding process is convenient to operate and low in cost.
Description
technical field [0001] The invention relates to a welding process, in particular to a WQ890D thick plate welding process. Background technique [0002] With the development of welding structures with high parameters, light weight and large scale, high-efficiency hydraulic transmission and support have been widely used in construction machinery and mining machinery. Correspondingly, it is required to greatly increase the load-carrying capacity of the welded structure under the condition that the self-weight does not increase much. In order to meet the above work requirements, high-strength steel welded structures must be used. [0003] In particular, with the continuous development of crawler cranes, especially the rapid development of large-tonnage crawler cranes in recent years, the requirements for the use and welding of high-strength steel materials are getting higher and higher. Specifically, in some large-tonnage crawler cranes, WQ890D high-strength steel is used as t...
Claims
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IPC IPC(8): B23K31/02
Inventor 付沛邓鉴棋
Owner SHANGHAI SANY TECH