CO_2自动焊接过程中,焊丝伸出长度的变化将引起焊接电流的变化,使焊接规范不稳定,影响焊接的正常进行。为此,研制了一种焊丝伸出长度自动调节器。调节器的基本原理在生产实践中,发现焊接电流与焊接电弧区参数有下列近似关系:I_焊≈V_弧/(R_咀+R_长+R_弧)式中:I_焊——焊接电流;V_弧——电弧电压; CO_2 automatic welding process, the wire length changes will cause changes in the welding current, so that the welding specifications are not stable, affecting the normal welding. To this end, developed a wire length automatic regulator. The basic principle of the regulator In the production practice, it is found that the welding current and welding arc zone parameters have the following approximate relationship: I_ welding ≈ V_ arc / (R_ Tsui + R_ long + R_ arc) Where: I_ welding - welding current; V_ arc - arc voltage;