Elbow is a commonly used connecting pipe fitting in plumbing installation, used for connecting pipes at bends and changing the direction of pipes. Other names: 90 ° elbow, right angle elbow, Love bend, stamped elbow, pressed elbow, mechanism elbow, welded elbow, etc.
1, After production, the work procedure for elbow cleaning:
1. According to the requirements and surface condition of the workpiece, alkaline cleaning, water-soluble cleaning agents, chlorine solvent sandblasting, shot blasting and other methods are used for cleaning
2. Generally, acid washing is not used for cleaning
2, Bend correction:
1. The workpiece is corrected using static load, and it is generally not advisable to strike locally
2. After correction, stress relief annealing should be carried out at a temperature lower than the original tempering temperature
3. Austenitic elbow workpiece, calibrated at 300 ° C? Perform stress relief treatment below C
3, Quality inspection of elbows:
1. The workpiece shall be inspected according to the items and requirements specified in the corresponding technical documents
2. When the mechanical properties of the workpiece are not qualified, the heat treatment can be repeated, but the number of repeated quenching or solid solution treatments generally does not exceed two times. Supplementary tempering of workpieces is not considered as repeated processing
3. Martensitic elbows and wear-resistant elbow workpieces in quenched or low-temperature tempered state should be preheated, annealed or high-temperature tempered before repeated quenching.
