Sharing China-Made with Global Customers
Sharing China-Made with Global Customers
1. What is arc striking? What are the methods of arc striking? What should we pay attention to when starting arc?
Arc striking is the process of igniting and generating stable arc. There are two arc striking methods: direct arc striking method and scratcharc striking method.
Directarc striking method: first align the electrode with the part to be welded of the weldment, touch it gently, and then lift the electrode for 2-3mm to ignite.
Strike the arc striking method, like striking a match, align the end of the electrode with the arc striking point, then gently make the electrode strike on the surface of the weldment with wrist force, scrape the distance of 10-20 mm, and lift the covered electrode by 3 mm.
Duringarc striking, it shall be lifted quickly, otherwise it is easy to stick to the work piece. If adhesion occurs, swing the welding rod left and right, and then pull it apart. If it cannot be opened, cutoff the welding line, loosen the welding tongs and treat the weldment after it is slightly cold.
Pay attention to the following points during arc striking:
(1) After arc striking, the arc length shall not exceed the diameter of the covered electrode. Do not use excessive force during arc striking to avoid cracking or even falling off of the coating at the end of the arc, which will affect arc striking and welding.
(2) Do not ignite weldments at will during arc striking, especially high-strength steel and low-temperature steel. This is because arc scratches are easy to cause hardening or micro cracks, which will reduce the corrosion resistance.
(3) During arc striking, if the weldment is connected with the electrode,it cannot be removed by shaking. After the electrode is cooled, it will be easy to remove it.
2. How to operate the tack welding before welding?
In order to fix the relative position of two weldments during welding,spot welding shall be carried out at both ends of the work piece before welding.
Clean the slag after fixing. If the weldment is long, a solder joint can be fixed every 200-300mm.
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