Zinc pipes can not be welded, because zinc melting point, boiling point is low, heat will produce a lot of smoke or explosion, so welding will produce a lot of gas holes and zinc oxide smoke, if zinc outside a weld can be thrown away, usually can use hydrochloric acid wear or surface melted zinc. It is better to use Copper-Silicon wire or copper-aluminum wire, using arc brazing technology, the shorter the arc, the better with pulse function.
Welding preparation: Before welding, burrs, oil, rust, dirt and oxide scale must be cleaned within 30 mm on both sides of the groove.
当施工环境温度低于零或钢的碳当量大于0.41%,结构刚度过大时，应在对象较厚时采取预热措施。预热温度为80 - 100,预热范围为板厚的5倍，但不小于100mm.
When the construction environment temperature is below zero or the carbon equivalent of steel is more than 0.41%, the structure stiffness is too large, preheating measures should be taken when the object is thicker. The preheating temperature is 80-100, the preheating range is 5 times of the plate thickness, but not less than 100mm.
当工件厚度大于6mm时，为了保证穿透强度，应在板的对接边缘采用开口切割V或X形坡口。槽的角度为60度钝边P为0 - 1mm,装配间隙B为0 - 1mm;当厚度差大于4mm时，厚板的对接边缘应倾斜。
When the thickness of the workpiece is greater than 6 mm, in order to ensure the penetration strength, V or X grooves should be cut openly at the butt edge of the plate. The groove angle is 60 degrees blunt edge P 0-1 mm, assembly clearance B 0-1 mm; when the thickness difference is greater than 4 mm, the butt edge of the thick plate should be inclined.
焊接前，检查CO2焊机的平稳状态和气体流量。如需使用瓶装气体进行排水和净化，则应检查气体压力。如果小于9.8 x 10.5PQ （10kgf/mm2），应停止。可根据不同的焊接工件和焊接位置，调整规格。焊接规范可采用以下公式：V=0.04I+16（公差误差+ 1.5V）
Before welding, check the steady state and gas flow of the CO2 welder. If bottled gas is used for drainage and purification, gas pressure should be checked. If it is less than 9.8 x 10.5PQ (10kgf/mm2), it should stop. Specifications can be adjusted according to different welding parts and welding positions. The following formula can be used for welding specification: V=0.04I+16 (tolerance error + 1.5V).
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