Blowhole formation in gas metal arc welding for sealing parts
密封形溶接における気孔発生原因

Hirozumi Azuma, Hisashi Sugimoto
1986 QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY  
In welding for sealing purpose, blowhole are frequently formed by a small rise of the pressure within a space sealed by welding. The critical pressure for blowhole formation was studied in relation to the clearance in weld joint. The clearance is simulated by the narrow hole provided in a block specimen. The inner space was filled with a gas and the outside of the hole was melted. The results are summarized as follows: (1) The critical pressure for blowhole formation is determined by the
more » ... t surface tension of the molten metal and the clearance in a weld joint. (2) The relation between the critical pressure (Pcr) for blowhole formation and the diameter (D) of the gas hole was given by the equations, Pcr-54.4=534/D (for air) Pcr+192 =592/D (for argon) (3) In welding for sealing purpose, it is effective for prevention of blowhole formation to decrease the pressure in a sealing space and to minimize the clearance in a weld joint.
doi:10.2207/qjjws.4.389 fatcat:runvbyikejhdlnjrc3b56jbr6q