船舶焊接生产基础 (14).pdf
Submerged arc welding The use of arc as a welding heat source welding when the arc is buried under the flux layer to burn the arc light is not exposed.Since the arc light is not exposed,how does it complete the welding?Principle of submerged arc welding 1Flux 2welding wire 3electric arc 4Molten pool 5slag 6welding seam 7workpiece 8Welding slag 9Flux funnel 10Wire feeding roller 11Conductive nozzle Principle of submerged arc welding a)焊接过程 b)纵向断面 c)横向断面 Good weld quality Low welding costs Good working conditions shortcoming merit High productivity VS Mainly suitable for horizontal Position weld welds Suitable for long straight welds Only suitable for welding of medium and thick plates Do not weld metals that are prone to oxidation Characteristics of submerged arc welding 1.High production efficiency During the welding process the arc burns under the flux layer,Metal spatter is small,loss is small,welding speed is large,and production efficiency is high.Advantages of submerged arc welding 2.Good weld quality(low tendency to weld defects)During the welding process The arc and molten pool are always protected by flux This reduces the nitrogen content in the metal molten pool At the same time,the molten pool cools the crystallization slowly The metallurgical reaction is sufficient Advantages of submerged arc welding 3.Low welding costs The welding current is large and the heat utilization rate is high,which can make the weldment obtain a large penetration depth When welding with submerged arc welding,the weldment can not be opened with a groove or a small groove Advantages of submerged arc welding 4.Good working conditions The welding process is automated Easy to operate The labor intensity of workers has been greatly reduced The welding arc burns under the flux layer There is no radiance of arc light Advantages of submerged arc welding Good weld quality Low welding costs Good working conditions shortcoming merit High productivity VS Mainly suitable for horizontal Position weld welds Suitable for long straight welds Only suitable for welding of medium and thick plates Do not weld metals that are prone to oxidation Characteristics of submerged arc welding 1.Only suitable for horizontal position welding Submerged arc welding relies on the accumulation of flux and the slag formed after melting to play a protective role.Disadvantages of submerged arc welding 2.Do not weld metal materials that are prone to oxidation Flux used in submerged arc welding The main ingredients are SiO2,MnO and so on Cannot be used to weld metal materials that are susceptible to oxidation Disadvantages of submerged arc welding 3.Only suitable for medium and thick plate welding When welded with a small welding current,the stability of the arc will decrease Disadvantages of submerged arc welding 4.Only suitable for long straight welds The action of gravity Limitations of submerged arc welding equipment Disadvantages of submerged arc welding Submerged arc welding operations Submerged arc welding principle Device connection Pros Cons Welding operations Submerged arc welding Course review Thanks for watching
