什么叫焊接条件（What is the welding condition）.doc

什么叫焊接条件（What is the welding condition） 1. what is the welding condition? What does it have? Answer: including welding around conditions: parent material, plate thickness, groove shape, joint form, constraint state, environment temperature and humidity, cleanliness, according to the above factors and determine the wire (or rod) type and diameter, welding current, voltage, welding speed, welding sequence, welding method, transport guns (or transport) method etc.. 2. what is called welded joint? How many basic forms are there? Answer: welding method to connect the joints. The welding joint includes three parts: weld, fusion zone and heat affected zone. The basic forms of joints are butt joint, corner joint, lap joint and T type connection. 3. what is called penetration? Answer: the depth at which the base metal is fused on the cross section of the welded joint. 4. what is called welding position? How many forms do you have? Answer: when welding, welding joints in the space position. A welding, vertical welding, horizontal welding and overhead welding etc.. 5. what is called vertical down welding and upward vertical welding? Answer: 1 vertical welding, the arc from top to bottom welding - called vertical down welding. Such as: cellulose electrode down welding; CO2 vertical welding and so on. When welding vertically, the welding of the arc from the bottom upwards is called upward vertical welding. 2. 6. what is called welding structure? Answer: welded steel structure is called welded structure. 7. why should the weldment be opened? Answer: groove - according to the design or process requirements, welding parts to be processed into a certain geometry, after assembly groove formed. In order to weld the weldment cross section and reduce the fusion ratio, the usual groove forms are: I, V, Y, X, U, K, J and so on. 8. why do some materials need to be preheated before welding? Answer: in order to slow down the cooling rate of weldment after welding, to prevent cold crack. 9. wh