| 摘要 |
PURPOSE:To produce a welded H-steel of the finest quality by controlling the welding conditions automatically in such a way that a temp. constant is maintained constant against the fluctuations in the welding factors and that the welding temp. is kept at the set value. CONSTITUTION:The respective measured values such as the thickness information sampled at a constant timing from a thickness gage 3, the welding current I and welding voltage E synchronized with this, and the welding temp. T from a two color thermometer 4, and the feed speed V of a welded H-steel 1 from a line speedometer 3 are inputted momentarily to an operator 9 provided to the welding line of the H-steel 1. These measured values are memorized in correspondence to the position of the H-steel 1, and from the memory values, a temp. contact K=(T+V)/(EXI) is operated. This constant K is compared with the set value K0 preset in the operator 9, and the welding temp. T is held at the set value by as much as the difference DELTAK therefore, whereby welding conditions such as the current I, the voltage E or the like are controlled when it comes to the position of the welding point on the axis of a pressure roll 11. |
