Aluminum HAZ embrittlement is often the root cause of broken tubes, induced catastrophic accidents. Partial embrittlement has two main areas, namely the heat-affected zone CGHAZ embrittlement due to grain grown too hot zone and cause adverse tissue formation, and when the multi-layer welding CGHAZ another critical embrittlement of aluminum square tube, that CGHAZ again before the weld by heating the two-phase region caused by subsequent passes. This is done by adding a certain amount of aluminum in the Ti, Nb micro alloying elements and control weld cooling rate to get the right t8 / 5 to improve toughness. Because of the low carbon content aluminum, hardened tendency decreases, cold cracking tends to decrease. But as the intensity level increases, the thickness increase, still has a certain tendency to cold cracking. Because often using cellulose electrodes, self-shielded flux-cored wire and other high hydrogen content of welding consumables, line energy is small, fast cooling, cold cracking susceptibility increases, the need to take the necessary time in the field of welding welding measures, such as welding development of China's aluminum industry has come before preheating transition had to turn in the past has been the extensive mode of production can not be sustained under the current new circumstances, aluminum industry difficulties give businesses survive the alarm sounded. Situation reform aluminum industry, it is necessary to change the past business conflicts within the industry supply of aluminum square tube price, disorderly competition in history, we must establish a more unified industry self-rule. Zhang pointed out that the supply price of aluminum square tube, to form a group through mergers few large supply of aluminum square tube aluminum manufacturers, improve industrial concentration, the formation of self-discipline, mutual win concept to aluminum demand in bad situations, effective cost reduction ease the contradiction between supply and reduce trade friction and maximize restore some economic losses. Aluminum Association pointed out that the slow growth in domestic demand for aluminum, aluminum production this year is expected to continue to maintain modest growth of around 3%. Our aluminum industry, high yield, high-cost, low-cost, low efficiency of the situation being difficult to change; and because of surging trade disputes, China's aluminum exports of high growth will be very difficult. Difficulties of aluminum industry, there is a contradiction between the current problems caused by institutional mechanisms focused on the outbreak, only speed up structural adjustment, urged industry to upgrade the whole industry to weather the storm. Jinan supply aluminum square tube manufacturers, rolls aluminum, aluminum square tube is provided by Jinan Heshun Aluminium Limited. Jinan Heshun Aluminum Co. (www.jnhsly.com) Shandong Jinan, aluminum products leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Aluminum leadership in cis with the staff warmly welcome all inquiries negotiations to create a better future for aluminum rolls.