Hainan Steel tells you: welding steel engineering shortcomings repair General Provisions

Hainan Steel tells you: welding steel engineering shortcomings repair General Provisions

When imperfections 1 weld metal or base metal exceeds the corresponding quality acceptance criteria, it can be grinding wheel, carbon arc gouging, and other mechanical chipping or eradicate. Before welding repair, clean the restoration surface area.
2 weld repair shortcomings should meet the following requirements:
1, weld tumor, projections or reinforcement should be used excessive wheel or carbon arc gouging eradicate excess weld metal;
2, weld sag, craters, undercut or lack of weld size and other shortcomings should be welding;
3, lack of fusion welding, weld porosity or slag and other shortcomings in the total eradication should be carried out after welding;
4, weld or parent metal cracks should adopt MT, PT, or other non-destructive testing methods to determine the scope and depth of the cracks, apply grinding wheel or carbon arc gouging for the Eradication of crack and two each 50mm long good welds or base metal, and applying penetrant or magnetic particle inspection method to determine crack completely eradicate, and then re-welding. For a greater degree of restraint on the joints crack repair welding, carbon arc gouging before eradicate crack, crack should eradicate shortcomings in the crack two drill holes and then stop. Crack repair welding, welding engineer shall notify the cause cracks on the investigation and analysis, should develop specific technical requirements after repair technology programs;
5, the preheating temperature of the weld repair shortcomings preheating temperature should be higher than normal welded under the same conditions 30 ℃ ~ 50 ℃, and should be used with low hydrogen welding method and welding materials for welding;
6, the weld repair area should be continuously welded, to be taken after the interruption welding heat insulation measures; Hainan Steel
7, the same parts of the disadvantages of the weld repair number should not be more than twice. When more than two repair welding technology should be preceded by technical assessment, and should be rated after passing subsequent repair welding. After repairing weld joint area should be increased powder or colored checks. Hainan Steel