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One of the main advantages of electroslag welding is that the beveling process is relatively simple. Generally, the steel plate can be electroslag welded after being thermally cut and removing oxides. Castings and forgings must be mechanically machined before welding due to large dimensional errors and uneven surfaces. The processing requirements of the welding surface and the minimum processing width are shown in Figure 1. When not used as an ultrasonic flaw detection surface, B ≥ 60 mm, and the processing roughness is RZ 25 μm. When it is necessary to use the oblique probe ultrasonic flaw detection, B≥1.5 times the workpiece thickness (Bmin≥6+50mm), and the processed surface roughness is Rz6.3μm.
For the surface that needs to be machined after welding, there should be a certain machining allowance before welding. The small amount of the person depends on the amount of welding deformation, the simple part of the heat treatment deformation with few welds, the machining allowance is 10-20mm, and the machining allowance of the complicated structural parts with more welds is 20~30mm.
Figure 1 Processing requirements of the welding surface and the minimum width of processing
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