研究目的
Investigating the influence of the laser hybrid welding parameters on the solidification cracks in the weld root for partial penetration welding.
研究成果
The study concluded that the welding velocity has a high impact on the solidification cracking phenomenon, with a decrease in welding speed leading to a reduction of the number of cracks in the weld root. The arc power has a slight influence, and the change of the focal position of the laser beam shows a remarkable effect. Numerical simulations assisted in understanding the thermomechanical behavior of the welds.
研究不足
The study is limited to thick-walled high-strength steels of grade S690QL and partial penetration welding. The influence of other materials and full penetration welding was not investigated.
1：Experimental Design and Method Selection:
The study involved welding trials on thick-walled high-strength steels of grade S690QL under the same critical restraint intensity, with variations in welding velocity, wire feeding rate, and the focal position of the laser beam. Numerical simulation was also performed to understand the thermomechanical behavior of the welds.
2：Sample Selection and Data Sources:
The experiments were conducted on 15-mm-thick plates of S690QL grade high-strength steel in a butt joint configuration. A solid wire Union X85 was used as a filler wire.
3：List of Experimental Equipment and Materials:
A high-power Yb:YAG thin disk laser TruDisk 16002 and a welding machine Quinto GLC 603 were used. The gas mixture consisted of 82% Ar and 18% CO
4：Experimental Procedures and Operational Workflow:
The Controlled Tensile Weldability test (CTW) was used for all experiments under a defined restraint intensity. The influence of the welding speed, wire feeding rate, and focal position on crack formation was investigated.
5：Data Analysis Methods:
The evaluation was carried out by means of X-ray examinations and metallographic examinations.
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