Introduction of seal weld

Seal welds are used to seal joints and they are commonly used in gas or liquid containers as well as pipeline to prevent leakage. With the protect of seal welds, gases or fluids will not enter into specific areas, which will guarantee the safety of project under construction and not cause damage. Seal welds are widely used to the parts that is to be galvanized especially for the galvanized steel pipe. We can divide ready-to-be galvanized joints into three types that is regular ,vented and a joint that does not require a seal weld. However, for vented and regular joints, they can be welded together respectively with seal welding. Notably, we should pay more attention on the joint of regular as it seeks to ensure that the seal welds are not so porous. Because porous seal weld will lead to leakage. Vented joint, just as the name implies, has vents or holes in them to allow gas to escape out. Ensuring a proper location when applying seal welds to vented joints is also very important to prevent damage might caused by a build-up of gas.

We must bear in our mind that seal welds are only regarded as containment measures instead of adding to the joint strength. It is essential for steel pipe supplier to check the seal placements before marketing products to see if the seal placements meet with the code requests stipulated by the American welding society. A range of code violations are viable in some instances, but we should ensure the flexibility of the joints to prevent some undesirable structural function. Besides, the seal welds can not have a great effect on ultrasonic inspections.

A welder must be equal to this job because of its specificity and they need to follow a unit of sound welding practice when engaging in this job. The scope of seal welding practices is large, including adhering to specified weld sizes and heat input. For round steel pipe, following the correct welding procedures is vital for the products quality. Other factors should also not be neglected such as selecting the right shaped electrode. In order to achieve complete fusion, the proper heating time and welding pressure is also essential for your reference to prevent crack in the seal weld.

Some manufacturers also adopt this method in the food processing and engineering industries. Apart from cold rolled steel pipe and containers, they expose steel elements undergo seal welding to avoid rusting. A pinch weld seal is used in both refrigerator and car doors.