In the long term, premature birth may lead to these complications: 1  Cerebral palsy. 2  Cerebral palsy is a disorder of movement, muscle tone or posture that can be caused by infection, inadequate blood flow or injury to a preemie's developing brain either during pregnancy or while the baby is still young and immature.
Before you even think about welding, make sure you have the right gear, including fire resistant jacket, safety glasses, welding gloves and an approved welding helmet. Helmets have come a long way in recent years.
Use of low-heat input welding techniques. These techniques minimize the time for carbide precipitation, thus minimizing the amount of chromium transfer to the carbides. This approach is often used when post-weld solution treatment is not practical, such as when finish-machined surfaces are involved. Design of the weld joint so that the heat-affected zone is not subject to the corrosive environment. Note that ASTM A744 allows welding without post-weld heat treatment if the wetted surface does not exceed 800 F. This recognizes methods 5 and 6 above. Additional points which should be mentioned include: Some people suggest that extra-low carbon grades do not need any heat treatment at all, that they can be used in the as-cast condition.