A tee is a pipe connector.It is also called pipe tee, tee pipe fitting or tee joint, three generality in the central heating pipeline branch, the main purpose is wide, wide industrial area, wide application range.Common copper of tee in the refrigeration industry, the traditional copper tee mainly lead method, the air conditioning copper tube laser cutting certain length, the lead into the molten the air conditioning copper tube wall, after being lead in air conditioning copper tube wall condensation, eliminate the adhesion on the surface of the air conditioning copper, lead, and air conditioning copper tube branch of lead, in air conditioning copper tube extrusion port drill a small hole, then to the grinding tool through four column hydraulic press lead within the tee to parts processing of the pressure makes it will air conditioning copper tube extrusion processing for air conditioning copper pipe tee.Tee forming to the tee to heating the lead after melt out, if the shape of the tee is Y type or other special-shaped tee, only in the molten lead in air conditioning copper tube wall again, after being lead in air conditioning copper tube wall condensation, reoccupy high-speed punch press bending extrusion processing and processing of semi-finished products into the required shape, laser cutting away the product capacity, heating to make products in the lead melt out of the products covered in the acid to remove adhesion in air conditioning copper tube wall of lead, in addition to the lead after cold water to clean.In order to prevent the product rebound, but also with high - speed punch press or other equipment shaping.The three branches of the flat tee pipe are then passivated, dried, tested and packed by pickling.It is easy to cause human body to contact with lead in the process of processing the three tong in the way of injecting lead, and lead can cause serious harm to human body, it mainly ingests the body through respiratory system and digestive system, if lead enters human body, it is difficult to discharge even through drug treatment.Lead chemicals can enter the body through the lungs, digestive organs, skin and other ways, in the human body slowly scrimping, it can prevent the growth and development of red blood cells, harm the nerve center, resulting in memory loss.Meanwhile, rising prices for lead, a non-renewable source of energy, have made the three links more expensive to manufacture.