1), welding rod use should be kept dry, titanium calcium type should be after drying at 150 deg.c for 1 hours, low hydrogen type should by 200-250 ℃ dry 1 hours (not repeated drying, or medicine skin easy cracking and spalling), prevent the covering of viscous oil and other dirt, so as not to cause increased carbon content and the influence of welding seam the welding quality.

2), high pressure elbow welding by repeated heating, carbide, lower corrosion resistance and mechanical properties.

3), to prevent the corrosion due to heating, the current should not be too big welding, carbon steel electrode less than about 20%, the arc should not be too long, interlayer cooling, a narrow weld bead is appropriate.

4), high pressure elbow after welding, hardening of large, easy to crack. If the high pressure elbow with the type of welding, should be preheated 300 ℃ and 700 ℃ after welding the slow cooling treatment. If the welding conditions can not be post weld heat treatment, should choose high pressure elbow electrode.