With the advancement and development of technology, the application fields of aluminum alloys are becoming wider and wider, so aluminum alloy welding problems are often encountered in the actual production process. If you master the following formula, the problem of aluminum alloy welding will basically be solved.
Aluminum welding is difficult to operate, and oxygen cracks can easily soften;
It is difficult to weld due to surface oxidation, so thorough cleaning is required before welding;
The power polarity works well, and cathode cleaning is very practical;
MIG must be connected directly and reversely, and AC current is the most commonly used;
High frequency is required for arc ignition, and pulse can be added for welding;
The second most difficult aspect of aluminum welding is the serious tendency of hot cracking;
There are many types of thermal cracking, with vertical and horizontal pit roots being the most concentrated;
The specific reason is that the solidification process shrinks quickly;
The stress stretches out the gap, and the liquid aluminum is insufficient to cause cracks;
Prevention and solutions are key, and process design can help;
The welding heat should be concentrated, and segmented preheating should reduce the welding speed;
The design of ingredients should be reasonable, and the role of trace elements should be clear.
Porosity defects are common, and aluminum welding is particularly sensitive;
Solve the three aspects of defects, material gas and environment;
The ambient humidity should be controlled, and work should be stopped if it exceeds 60%;
Cleaning the base material is very important, removing oil and water stains from the surface;
Attention should be paid to the use of welding materials, and drying inspection is necessary;
The protective gas should be clean and the purity should be four nines;
At the same time, the flow rate should be controlled, neither too large nor too small;
Welding should be done according to the regulations, and the problem of pores will disappear.
Welding deformation makes people worry, grasp the essence to eliminate worries;
The expansion coefficient is the main reason, and improvement should start from here;
There are many types of adjustment methods, and the changes are restrained and leave margin;
The process parameters should be standardized, and preheating should be done;
The above specifications must be strict and the quality requirements must be met responsibly.
There is a risk of joint softening, so strictly control and inspect it;
Material technology is the key, and the base metal and welding materials should match;
Don't say donkey's lip to horse's mouth, the intensity should be corresponding;
Process design should also be used to reduce parameters to prevent coarsening;
Concentrate heat and reduce the area to prevent area expansion;
Various problems can be solved, and welding assessment is indispensable;
Welding man-machine-material method, every link must be strict;
Preparations before welding should be complete, and inspections should be made during and after welding;
Practical problems lead to practical methods, and practice plays the most critical role.