1, precision cold drawn tube weld butt welding the weld, mainly for welding fixture and jig stroke is not enough too fast docking two cases caused by.

a、对接焊接夹具行程不够。冷拔精密管连接件对接前用铣刀铣平关口后进行焊前试碰，碰对后在夹具行程杆上应看到有一定的行程余量，行程余量以不小于200mm为宜。在焊接过程中若不注意这种情况，夹具的行程余量不够时，焊接后表面上看对接得非常好，但实际上两对接件熔接得不够彻底，出现虚焊。这是热熔对接焊中常出现而又不易察觉的问题。解决的办法是每次焊前都应注意留有足够的夹具行程余量。

A, the butt welding jig is not enough. The cold drawn precision pipe connector is tested before milling before milling. After the collision, there should be a certain travel allowance on the fixture stroke rod. The allowance should be no less than 200mm. During the welding process, if you do not pay attention to this situation, the fixture travel allowance is not enough, after welding on the surface of docking is very good, but in fact the two pieces of butt weld was not thorough enough, appear. This is a common and undetectable problem in the hot-melt butt welding. The solution is to pay attention to the spare allowance of the fixture before each welding.

b、冷拔精密管对接件对碰时夹具速度太快。两连接件经加热板加热后进行对碰，若对碰过程中夹具速度太快，在对碰瞬间，两连接件熔融部分大部分被挤压到内外壁两侧，致使熔合的部分不够充分而造成虚焊。解决的办法是操作人员控制机具速度均匀，使熔接部分充分熔合。

B, a kind of precision cold drawn tube butt fixture too fast. The two connecting piece by heating board after the collision, if the collision process fixture too fast in touch instantly, the two connector is extruded to the melting part of inner and outer walls on both sides, resulting in the fusion part caused by inadequate. The solution is that the operator controls the speed of the equipment and makes the fusion part fully fuse.

2、焊不透出现这种情况的主要原因是加热时间不够。一般情况下不同的管材、不同型号及规格的卡压式水管，其焊接加热时间在出厂时都有规定，但所给加热时间是在环境温度为20℃、有微风时设定的，当环境温度低于10℃和风力较大时，若按设定的加热时间进行加热焊接，焊接后表面上与正常焊接没有多大区别，但实际上没焊透。解决办法是当遇到施工环境低于10℃和风力较大时，应根据管材不同型号、规格适当调整加热时间。

2. The main reason for this situation is that the heating time is not enough. Card type pipe and tube of different types and specifications of the general, the welding heating time is stipulated in the factory, but the heating time is when the environment temperature is set at 20 C, when the breeze, when the ambient temperature is below 10 DEG C and the wind is large, if the heating time is set heat welding, after welding on the surface of normal welding and there is not much difference, but in fact no penetration. The solution is to adjust the heating time according to the different types and specifications of the pipe when the construction environment is below 10 degrees C and the wind is large.

3、冷拔精密管焊口透化发生这种质量问题的原因是加热时间过长，与焊不透的情况正好相反，对于热熔对接焊，有些施工人员认为焊接过程中加热时间越长，焊接效果越好。而事实恰好相反，冷拔精密管在加热时间过长时，会出现碳化现象，严重影响到冷拔精密管焊接质量。

3, the quality problem caused by the penetration of the cold drawn precision pipe weld is due to the fact that the heating time is too long, which is just the opposite of the incomplete welding. For the hot butt welding, some builders believe that the longer the heating time is, the better the welding effect is. In fact, on the contrary, the cold drawing precision tube will be carbonized when the heating time is too long, which seriously affects the welding quality of the cold drawing precision tube.