Abstract
The paper presents robotic spot resistance welding technologies for DOCOL 1200M steel with a thickness of 1.8 mm. DOCOL 1200M steel with a martensitic structure is intended mainly for the production of car bumpers, side beams and other elements ensuring the safety of the user of motor vehicles. The test joints were made on a robotic station equipped with a KUKA KR180 robot and a welding from ARO. The obtained welded joints were subjected to macro and microscopic metallographic tests, hardness measurement and strength tests. It has been shown that for properly selected resistance spot welding, DOCOL 1200M steel joints with a satisfactory strength level can be obtained.
Highlights
The car industry is an important part of both the global and national economy
The aim of the research was to determine the structure and properties of the lap joints of sheets with a thickness of 1.8 mm made of high-strength low-alloy steel DOCOL 1200M, with a martensitic structure joined by a resistance spot welding technique
Metallographic microscopic examinations (Fig. 4) showed that in the heat affected zone preheated below the Ac1 temperature, the degree of martensite tempering increased with respect to the structure of the native material
Summary
The car industry is an important part of both the global and national economy. The increase in the revenue of this field directly affects the development of production technology, introducing innovations and investments in finding new materials from which individual car components are made. The cost of research related to materials and the requirement to reduce the weight of vehicles caused that manufacturers in the automotive sector are increasingly starting to reach for aluminum alloys, composites and steels with increased durability. In order to meet this demand of the automotive industry, Advanced High-Strength Steels (AHSS) were created. These materials proved to be successful in the production of vehicles due to three very important features: high tensile strength, up to 1700 MPa, yield strength, up to 1450 MPa and A80 elongation, up to 30%. The AHSS steels are often used in the automotive industry, because they give the possibility to reduce the thickness of car body plates and car body support elements, while increasing the mechanical properties in combination with conventional steels. An additional advantage of AHSS steel is the relatively low price, due to the small amount of alloy additives in steel [1÷14]
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