石英玻璃是一种绝缘性能好、热膨胀系数小的耐高温材料(1400℃左右)。实践证明,用石英玻璃制成的焊枪嘴,比其它材料制成的枪嘴优点较多,使用效果良好。以前大多用紫铜和不锈钢做枪嘴。由于连续工作时间长,焊接电流较大,枪嘴口很快就烧坏,几天就得换一个。另外,当焊件间空隙较小(如焊变压器引线),焊枪刚刚能下去时,过高的温度,将使绝缘破坏,造成金属焊嘴与焊件放电,击黑焊件表面,还容易 Quartz glass is a kind of high temperature resistant material (about 1400 ℃) with good insulation property and small thermal expansion coefficient. Practice has proved that torch nozzle made of quartz glass, gun nozzle made of other materials more advantages, the use of good results. Mostly used to do with copper and stainless steel muzzle. Due to long working hours, large welding current, the mouth soon burn out, a few days have to change one. In addition, when the gap between the weldment is small (such as welding transformer lead), the torch just can go down, the high temperature, will make the insulation damage, causing the metal tip and weldment discharge, the black weldment surface, but also easy