Small diameter pipe welding need to pay attention to clean up the slag, transport method, molten pool changes and inspection requirements of these items. Clean up the slag is to avoid impurities into the buried hidden trouble; transport method should pay attention to preheating, electrode selection and welding methods; and finally check to ensure that the weld meets the technical requirements. Do these items, small diameter pipe quality is guaranteed.
Clean up the slag:
We need to carefully clean up the slag around the weld before welding, to ensure that the welding position is clean, to prevent the welding of impurities mixed in and buried hidden dangers.
Transportation method:
First in the position of the back welding arc, and then use the long arc on the back welding part of the preheating, in the preheating process, due to the liquidity of the droplets at this time is relatively poor, and the real-time temperature is relatively low, so the first and second droplets need to be discarded, do not carry out the use of subsequent need to use the crescent-shaped strip for welding (the use of transverse serrated strip can be). This process needs to maintain a short arc to weld, to both sides of the swing welding rod should be a slight pause for a while, so that the material at both ends of the weld a smooth transition, so as to avoid the occurrence of biting defects and other phenomena not in line with the norms.
Molten pool changes:
It should be noted that in the welding process should always keep an eye on the molten pool changes, to ensure that the molten pool to maintain the oval shape, and the size should be consistent, bright and clear.
Check quality:
The focus is on the need to check whether the weld is well formed and whether the residual height meets the technical requirements. A good weld should ensure that the surface of the material has a smooth transition and there is no biting edge.
