Can anybody suggest me the joining process of mild steel and aluminium.If this is possible,please let me know the specification of  arc welding electrode or gas welding flux

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You need to consider galvanic corrosion.  It is better to bolt them together, not weld them.

Metal arc welding, gas tungsten arc welding, gas metal arc welding, and submerged arc welding can be used to join dissimilar metals but the high energy inputs of these welding techniques may result in material metallurgical mismatch. Therefore advanced welding techniques like laser welding, ultrasonic welding, friction spot welding, and friction stir welding processes are more feasible.

a lot of thanks

Ramakrishnan Pravin said:

Metal arc welding, gas tungsten arc welding, gas metal arc welding, and submerged arc welding can be used to join dissimilar metals but the high energy inputs of these welding techniques may result in material metallurgical mismatch. Therefore advanced welding techniques like laser welding, ultrasonic welding, friction spot welding, and friction stir welding processes are more feasible.

Can anybody suggest me the joining process of mild steel and aluminium.If this is possible,please let me know the specification of arc welding electrode or gas welding flux

In dissimilar-metal welding, the prop- erties of three metals must be considered: the two metals being joined and the filler metal used to join them. For example, if one of the metals being joined is welded using preheat when welding to itself, pre- heat should be used in making a DMW.

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