电焊技术入门基础教程（Basic course of welding technology）.docVIP

电焊技术入门基础教程（Basic course of welding technology） Basic knowledge of welding skill application Welding is widely used in all walks of life and needs it. It is a very popular skill. Electric welding is an easy technique to learn, but to make good use of it depends on the individuals ability to comprehend, plus theoretical and practical learning. Is the actual classification of welding welding, cutting and similar. Ordinary welding with argon arc welding, gas welding and so on. Main points of welding technology; practice. Truth comes from practice after all! What welding methods are there for welding (manual welding)? 1G: 2G: flat or rotating transverse or vertical fixed welding 3G: 4G: 5G: 6G:45 level of fixed overhead welding: welding fixed degree 5GX (down) t: fillet (various locations) When welding seam, how to weld the most flat surface? Welding with arc welding forming is better than current, current 10% small flat, the angle is 70 to 75 degrees. We usually use serrated and crescent transport method, is mainly applicable for yourself. When welding erect seam, can have small crack sometimes, how to return a responsibility? There are many reasons for the cracks, which can be found from the following aspects: What kind of material is 1., which should be chosen, according to the material and welding material; 2. joints, choose suitable welding criterion, when necessary through the test to determine the welding process parameters, but also pay attention to the control layer temperature when multi pass welding; 3. according to experience, two pieces of such thick welding should be preheated before welding. After consultation, the reason and solution of the cracks in the welded pipe are discussed The cause of the crack: 1., the shrinkage stress of welding seam is too large, it is easy to produce slow crack. 2. uneven heating of welding seam, brittleness is easy to occur. 3. welding method and order is unreasonable. Temperature control between the 4. floors is not good. Pr