Welding heat input distribution and dilution ratio prediction based on thermal power
[Objective]The heat input QUI only briefly describes the source and magnitude of welding energy,without clarifying how the heat absorbed by the weld and base metal is distributed.[Methods]In this paper,the thermal power PPR concept based on the amount of filled metal was used to realize prediction of welding heat input distribution and dilution ratio by means of weld size measurement,JmatPro and formula calculation.[Results]Based on PPR,the melting base metal area Amb could be predicted,and its curve change could be divided into three stages,gradual increase zone,rapid increase zone and slow increase zone.Combined with the specific heat capacity of material volume calculated by JmatPro and Amb prediction formula,the effective welding heat input Qe under different PPR could be subdivided.It was found that the heat input of forming weld in the weldable zone only accounted for 31.77%to 34.69%.[Conclusion]The prediction formula of weld area percentage dilution ratio δ based on PPR was proposed,and the welding thermal power of weldable zone was 12.69～47.88 kW/cm2,and the dilution ratio was 48.28%～85.03%.
万方数据
维普
