Precautions for welding and welding As shown, the welding of the entire spring plate weld is carried out in 4 layers and 7 passes. The interlayer temperature should be controlled at 50e (it is suitable for hand touch). After each weld is welded, the hammering treatment should be thoroughly carried out (each hammer should be repeatedly hammered 3 times in all positions on the surface of the weld bead, so that the surface of the weld is blurred). The thickness of each layer of weld is preferably about 5 mm. Starting from the second weld, segment welding is performed and the segmented weld is hammered.
The second layer of the second weld is welded as shown in the figure, the second layer of the second weld is divided into two parts. Semi-automatic gas shielded welding, <1.2 welding wire, reasonable welding parameters such as welding current and voltage of 515 Dongfang Electric. Weld as shown, hammer, and then weld | segment, hammer, and cool.
The third, fourth and fourth welds of the third layer are welded as shown in the fifth, sixth and seventh welds of the fourth layer, the third and fourth passes of the third layer, and the fifth, sixth and seventh welds of the fourth layer. Sewing, |, § and, 4 sections of welding. The third layer of the third weld: semi-automatic gas shielded welding, <1.2 welding wire, reasonable welding current, voltage and other welding parameters. Welding as shown, section, hammering, cooling; then welding § section, ̈ section, hammering, cooling. The third layer of the fourth weld and the fourth and fifth welds of the fourth layer are welded in the same manner as the third and third welds. The welding method of the 7th weld of the 4th layer is the same as that of the 3rd weld of the 3rd layer, but the surface weld should be protected against undercutting.
Conclusion Through the pre-simulation welding test, the more mature 400MW gas turbine generator tangential spring plate welding process was obtained. The assembly and welding of the first gas turbine spring plate were completed with high quality and satisfactorily. The company's first 400MW gas wheel was captured. The generator and the first base tangential spring plate are difficult to weld.
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