304 Stainless Steel Welded Pipe

304 stainless steel welded pipe welding, the first use of arc welding to live fixed to prevent deformation of welding, resulting in other positions of the size deviation, and then the welding sequence is the first welding plane position, and then welded diagonal, so that the welding pair Angle, there will not be too much welding deformation.

1,304 stainless steel welded pipe with titanium calcium type and low hydrogen two. Welding current as much as possible to use DC power, is conducive to restraining electrode redness and penetration depth. Titanium calcium type electrode coating is not suitable for all-position welding, flat welding only suitable for peace welding; low hydrogen-type electrode can do all the welding electrodes.

1. Stainless steel electrode should be used in the boring. To avoid the occurrence of cracks, pits, pores and other defects, titanium calcium type coating by welding 150-250? drying 1h, low hydrogen type coating before welding by 200-300? drying 1h. It can not repeatedly repeated drying, or easy to fall.
2. Weld clean and clean, but also to avoid welding rod stained with oil and other dirt, so as not to add the weld carbon content and affect the quality of welding.
3. In order to avoid the occurrence of intergranular corrosion and heating, welding current should not be too large, generally should be 20% lower than the carbon steel electrode, the arc should not be too long, fast cooling between layers to narrow-channel welding is appropriate.
4. Should try to use short arc welding, arc length of the ordinary 2-3mm, arc is too long prone to hot cracks.
5. The transport of articles: should be used in short arc rapid welding, generally do not allow horizontal swing, the goal is to reduce the 304 stainless steel welded pipe heat of welding and heat-affected zone width, improve weld resistance to intergranular erosion and reduce hot cracking tendency.
6. Docking primer, in order to prevent the back of the bottom weld is oxidized, the back also need to implement gas protection.
7. To make argon well protect the weld pool, and to facilitate welding operations.

A worker from a steel pipe company, which is located in China.