Pressure Butt Welding of Steel Pipes Using High Frequency Induction Heating (Report 1)

Relation between Welding Conditions and Mechanical Properties of Pressure Welded Parts

Abstract

Pressure butt welding using high frequency induction heating has already been used practically in many fields. However its application is limited to seam welding of pipes or low pressure pipe lines and seldom extended to high pressure lines.
This paper deals with the results of experimental fabrication of carbon steel pipes and low alloy steel pipes (ICr-1/2 Mo) and discusses the investigation on how far the welding conditions affect the mechanical properties of pressure welded parts.
(1) It is necessary to finith the surface condition of pressure butt welded part to ∇∇ in actual work.
(2) The mechanical properties of pressure welded part are not necessarily better when using shielding gas than when not using it.
(3) Upset volume is to be 1.0-1.5t (t: pipe thickness).
(4) Heating temperature is to be kept at more than 1, 300°C on the innerside of pressure butt welded part.