| 摘要 |
PURPOSE:To eliminate the need for intricate control and to perform gas pressure welding on steel pipes quickly and surely, by pressurizing the steel materials mechanically when the butt end faces of said materials begin to melt by a heating flame then shutting off the flow of gases manually to extinguish the heating flame. CONSTITUTION:Steel pipes 24a, 24b are held with both clamps 22, 23, and the dislocation between both end faces 27 of both steel pipes is adjusted with a vertical adjusting lever 23. Gases are supplied from bombs 47, 48 to a burner 29 and the burner is ignited. The operator adjusts the heating flame of the burner 29 in this state so as to conform the same to the butt line correctly by turning a knob 37 and moving a block 28 axially by means of a screw 36 and a nut part 37. The operator oscillates the burner 29 repeatedly in the circumferential direction manually with an oscillation lever 34 in order to heat the pipes 24 uniformly in the circumferential direction thereof. When the operator admits the melting of the faces 27 that initiates from the surface, the operator turns the switch 41 of a hydraulic pump 39 on to feed 40 oil to a pressurizing cylinder 38, thereby operating a ram 44. As a result, a movable part 45 is moved according to the preset rate of upsetting, whereafter the operator shifts the manual layers 53, 54 of devices for opening and closing the gases to extinguish the heating flame and the press welding is completed. |
