Submerged-arc welding technology of big-thickness low-temperature steel plate with yield strength of 690MPa grade
A yield strength, submerged arc welding technology, used in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of low strength of welded joints, restricted development, strong delayed crack sensitivity, etc., and achieve high strength and low temperature impact toughness. Good, preventing serious welding deformation and overcoming cold crack sensitivity
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Embodiment 1
[0022] The thickness of the substrate steel plate is 100mm thick quenched and tempered steel plate F690, the yield strength is 730MPa, the tensile strength is 860MPa, the elongation is 16%, and the impact energy at -60°C is 305J. The size of the welding plate is 1000mm (length) × 500mm (width); the groove is a symmetrical double U shape, the groove angle is 35°, the thickness of the blunt edge is 4.5mm, and the gap between the blunt edge is 2mm.
[0023] The results of welding cold crack susceptibility test are shown in the table below:
[0024] pre-heat temperature
room temperature / no preheating
50℃
100℃
150℃
200℃
250℃
Crack rate
90%
75%
52%
25%
0%
0%
[0025] According to the above results, it is necessary to preheat over 200°C to effectively prevent the occurrence of welding cold cracks; select the following welding process parameters for submerged arc welding: welding current 480A, welding voltage 31V,...
Embodiment 2
[0030] The thickness of the substrate steel plate is 80mm thick quenched and tempered steel plate F690, the yield strength is 745MPa, the tensile strength is 855MPa, the elongation is 17%, and the impact energy at -60°C is 285J. The size of the welding plate is 1000mm (length) × 500 (width); the groove is a symmetrical double U shape, the groove angle is 32°, the thickness of the blunt edge is 4mm, and the gap between the blunt edge is 1mm.
[0031] The results of welding cold crack susceptibility test are shown in the table below:
[0032] pre-heat temperature
room temperature / no preheating
50℃
100℃
150℃
200℃
250℃
Crack rate
90%
75%
52%
25%
0%
0%
[0033] From the above results, it is necessary to preheat over 200°C to effectively prevent the occurrence of welding cold cracks; select the following welding process parameters for submerged arc welding: welding current 650A, welding voltage 35V, welding spee...
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