金屬卷焊管直流電阻釬焊動態(tài)分析及控制

DYNAMIC ANALYSIS AND CONTROL OF THE D. C. ELECTRIC-RESISTANCE BRAZING PROCESS FOR STRIP-WELDED PIPES

摘要: 本文對釬焊過程進(jìn)行了動態(tài)分析。首先推導(dǎo)了動態(tài)分析的基本理論式,然后對比研究了在恒電流和恒電壓兩種不同的控制制度下管坯橫截面積變化和速度波動對釬焊溫度的影響。結(jié)果表明,恒電壓控制是一種較為有效的卷焊管釬焊溫度控制方法。分析還表明,為保證釬焊溫度的穩(wěn)定,卷管用帶鋼不僅厚差要小而且厚度變化周期還要盡可能大。

Abstract: Dynamic analysis of the brazing process is made. First, the basic theoretical formulas for the dynamic analysis are derived, then the effects of stock cross-section fluctuation and welding velocity undulation on brazing temperature under either constant-current control or constant-voltage control are compared and studied. It shows that the constant-voltage control is an effective method of controlling brazing temperature for strip-welded pipes. It also shows that wall-thickness variations of strips should be as small as possible and the variation cycle should be as long as possible in order to ensure stable brazing temperature.