Argon arc welding pig iron
Pig iron can be welded. It is necessary to use nickel based welding rod. Before welding, it must be preheated evenly. When welding, it is necessary to strike constantly to eliminate stress and prevent cracking
Iron welding is very difficult. The local post weld Ling hard phenomenon is very serious. Tends to cause local stress concentration caused fatal crack welding quality is difficult to guarantee because of too much carbon equivalent, causing the welding difficulty, need preheating, and heat treatment after welding, after welding the parts can be used, and the performance of the joint unstable welding iron, general to go through the following steps: 1. groove. 2. preheat. 3. electrode selection. J506 electrode is selected and wrapped with pure copper wire.
After welding heat preservation, it is better to bury by furnace slag. It is a mistake to say that pig iron cannot be soldered, but it is a little more complicated. This is mainly because the iron is brittle, elastic, easy machining, casting, welding is not easy, it is mainly used for machine body, shell, base, iron and so Yaoqiubugao first understand several definitions: in general, the carbon content of less than 0.5% is called wrought iron (some information for 0.4%, and 0.05%, not common); carbon steel is 0.5%-2%, accurate below 2.11% for carbon steel; while 2.11%-6.69% is the most commonly used cast iron, cast iron carbon content is 2.5%-4.0%. The carbon content of pig iron is super high, and its corrosion resistance is worse. More than 2% of the carbon content is called pig iron, pig iron, because the carbon equivalent is too large, usually do not use, it is difficult to weld, welding stress after the large, prone to cracks. Pig iron contains a large number of harmful elements: S, sulfur, P, phosphorus and so on, making comprehensive mechanical performance is very low. Can weld,Preheat before welding and after welding heat treatmentSuitable welding wire is adoptedWeld open gap, delamination
