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TIG焊接钼钨铬双金属耐磨钢板工艺特点

所属分类:公司动态 发布时间:2021-04-25 来源:https://www.lcnaimoban.com/ 浏览量:

1、电流种类的选择
1. Selection of current types
一般根据钼钨铬双金属耐磨钢板的材料选择电流种类,焊接电流大小是决定熔深的主要参数,它主要根据钼钨铬双金属耐磨钢板的厚度、接头形式、焊接位置等因素选择。
The type of current is generally selected according to the material of mo-w-cr wear-resistant steel plate. The welding current is the main parameter to determine the penetration, which is mainly selected according to the thickness, joint form, welding position and other factors of mo-w-cr wear-resistant steel plate.
2、钨极种类、直径和端部形状的选择
2. Selection of tungsten electrode type, diameter and end shape
钨极种类及直径根据钼钨铬双金属耐磨钢板和焊接电流大小、电流种类来选择。
The type and diameter of tungsten electrode are selected according to the size and type of welding current.
钨极端部形状是一个重要的工艺参数,根据所用的焊接电流种类,选用不同的端部形状。夹端角α的大小会影响钨极的许多电流、引弧及稳弧性能。小电流焊接时选用小直径钨极和小的锥角,可使电弧容易引燃和稳定;在大电流焊接时,增大锥角可避免尖端过热而熔化,减少损耗,并防止电弧往上扩展而影响阴极斑点的稳定性。使用过程中钨极经常需要用砂轮或者专用的钨极磨削机进行修整。
The shape of tungsten end is an important process parameter. According to the type of welding current, different shape of tungsten end is selected. Pinch point angle α The size of the tungsten electrode will affect a lot of current, arc striking and arc stability. Small diameter tungsten electrode and small cone angle can make the arc ignite and stable easily; In high current welding, increasing the cone angle can prevent the tip from overheating and melting, reduce the loss, and prevent the arc from expanding upward and affecting the stability of cathode spots. In the process of using tungsten electrode, grinding wheel or special tungsten electrode grinding machine is often used for dressing.
Mn13耐磨板
3、气体流量和喷嘴直径
3. Gas flow and nozzle diameter
在一定条件下,气体流量和喷嘴直径有一个最佳范围,此时,气体保护效果最佳,钼钨铬双金属耐磨钢板上有效保护区域最大。
Under certain conditions, there is an optimal range of gas flow rate and nozzle diameter. At this time, the gas protection effect is the best, and the effective protection area of mo-w-cr bimetal wear-resistant steel plate is the largest.
如果气体流量过低,气体法奥迪堆焊耐磨板(8+8)排除周围空气能力弱,保护效果差;流量过大,气体排出时容易形成紊流,使空气卷入,也会降低保护效果。同样,在气体流量一定时,喷嘴直径过小,保护区域小,且因气流速度过高而形成紊流,喷嘴直径过大,不仅妨碍焊工观察,而且流速过低,保护效果也不好。一般手工TIG焊喷嘴内径范围为5-20mm,流量范围为5-25L/min。
If the gas flow rate is too low, the ability of eliminating the surrounding air is weak and the protection effect is poor; If the flow rate is too large, it is easy to form turbulence when the gas is discharged, so that the air is involved, which will also reduce the protection effect. Similarly, when the gas flow rate is constant, the nozzle diameter is too small, the protection area is small, and the turbulence is formed due to the high air flow speed. The nozzle diameter is too large, which not only hinders the welder's observation, but also has low flow rate, and the protection effect is not good. In general, the inner diameter range of manual TIG welding nozzle is 5-20 mm, and the flow rate range is 5-25 L / min.
4、焊接速度
4. Welding speed
焊接速度的选择主要根据钼钨铬双金属耐磨钢板的厚度决定并和焊接电流配合以获得所需的熔深和熔宽。在高速自动焊时,还要考虑焊接速度对气体保护效果的影响。焊接速度过大,保护气流严重偏后,可能使钨极端部、弧柱、熔池暴露在空气中。因此必须采用相应措施如加大保护气体流量或将焊枪前倾一定角度,以保持良好的保护作用。
The selection of welding speed is mainly based on the thickness of mo-w-cr bimetal wear-resistant steel plate and is matched with the welding current to obtain the required penetration and width. In high speed automatic welding, the influence of welding speed on gas protection effect should also be considered. If the welding speed is too high and the shielding gas flow is too far behind, the extreme part of tungsten, arc column and molten pool may be exposed to the air. Therefore, corresponding measures must be taken, such as increasing the flow of shielding gas or tilting the welding torch forward at a certain angle, to maintain good protection.
5、喷嘴与焊件间距离
5. Distance between nozzle and weldment
距离越大,气体保护效果越差,但距离风机叶片耐磨复合板(12+8、10+8、8+6)太近会影响焊工视线,且容易使钨极与钼钨铬双金属耐磨钢板间造成短路,产生夹钨。一般喷嘴端部与钼钨铬双金属耐磨钢板间距离在8-14mm之间。
The larger the distance, the worse the gas protection effect, but too close to the fan blade wear-resistant composite plate (12 + 8, 10 + 8, 8 + 6) will affect the welder's line of sight, and it is easy to cause short circuit between tungsten electrode and mo-w-cr bimetal wear-resistant steel plate, resulting in tungsten inclusion. Generally, the distance between nozzle end and mo-w-cr bimetal wear-resistant steel plate is 8-14mm.
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